I support this letter 100%. The tone is appropriate under these circumstances.
The Jackson brothers have always been big-headed thanks to Michael's success (just look at how lots of his brothers now call themselves a "dynasty"), have lived a carefree life thanks to Michael's generosity (and instead of budget with the received money some of them have blown it). They are just simple musicians, no smart men.
Now they wonder why many fans neither trust nor have much respect for them with all the dubious things they have done (e.g. Randy disappeared with the fans' donated money through MJJSource without a word; Jermaine introduced Tohme Tohme to Michael; Katherine signed a deal with Howard Mann - as she's too old and very naive [which btw she's tramsitted to her son Michael], the same person Janet and Michael have sued previously; Joe is exploiting Michael's name - again - for merchandizing; some family members claim that Michael's last will would be faked because they neither accept nor understand why Michael didn't want them to control his estate).
And let's not forget that the same persons that now complain about not receiving much respect from the fans are those that have supported and PUBLICLY encouraged fans to hate/attack the Cascio family. So it's okay to dictate L.O.V.E. towards them (simply because they are MJ's family) but H.A.T.E. towards others???
Remember Taryll Jackson's "oh-so-magnificent" words with heavy accusations:
Taryll Jackson (3T) said:
How they constructed these songs is very sneaky and sly. many people who have worked on this project either have strong doubts and questions while others KNOW the truth yet decided to turn and look the other way with their hands out for $$$. I will NEVER look the other way. Right is Right, Truth is Truth, Facts are Facts and it will all come out!!! I tried so hard to prevent this craziness, but they wouldn't listen. I KNOW my Uncle's voice and something's seriously wrong when you have immediate FAMILY saying it's not him.
[...]
We are still waiting for confirmation that the statement yesterday by Howard Weitzman (on behalf of the estate) is real and official. There are many blatant inaccuracies and omissions which makes me think it is not. I'm waiting on a phone call or the statement to be posted on an official site (such as michaeljackson.com) before I respond.
[...]
You will hear my story because this is way too important for my Uncle's legacy. The truth will prevail.
[...]
Frank hurt and betrayed my Uncle years ago, so when I learned about Eddie I wasn't completely shocked. The names are different but the story's the same. People taking advantage of my Uncle and now his legacy. I wish Oprah would have asked about the ridiculous amount these FAKE songs were sold to the estate for.
Nothing but much hot air. Fine words butter no parsnips - talk is cheap!
So the Jackson family shall know Michael so much better (as he's emphasiszing so beautifully)? Unfortunately reality has proven us the contrary: Michael has chosen to distance himself from most of his family in great measure and has spent more time with the Cascio family (which he called his "first family of love") than with his own family in his last years. Some of the Jacksons have shown much disrespect/jealousy and hatred towards the Cascio family as a result.
Furthermore you can see that Taryll is talking about $$$ on every occascion and that his lovely family should manage Michael's estate. Yes, exactly because you aren't money-grubbing at all, you would never line your own pockets (Oops!), you aren't incapable of being economical (you would have even increased Michael's debt mountain) etc. Not to mention you have tried several times to get rid of both of the MJ Estate's co-executors John McClain and John Branca.
And where's his "story"? Ain't it "way too important for [his] Uncle's legacy". You can't be fainéant, especially when you would have to act before any criminal and claims subject to private law
are at risk of limitation of claim. Yeah, you can slander for all eternity but there's no everlasting room to act.
No, how marvelous, this charade.
More probably Taryll is busy with preparing for rehearsing for the ill-fated "tribute concert"...
At least some doubters' one-and-only chance named "Birchey" who'll soon be trying to do what Taryll just claimed to do has more courage than them.
Annex: tweets to Taryll Jackson (no response, of course):
@tarylljackson U complain about some fans being hateful 2 ur family, yet u support and publicly encouraged fans to hate the Cascio family?
@tarylljackson And instead of proving that ur accusations against Cascio would b true, u r doing absolutely NOTHING about it.
@tarylljackson You've claimed that Frank Cascio betrayed MJ. U said this: U'll hear my story because this is way 2 important for MJ's legacy
@tarylljackson U can't demand that fans trust u when u r bad-mouthing the Cascio family without any proof. U even call MJ's will faked.
@tarylljackson What r u waiting 4? It's easy 2 attack others and 2 claim to know "the truth". U r doing nothing 2 prove ur claims though!
@tarylljackson On the 12th of September 2011 a fan is going 2 accuse the Cascio family of fraud, assured by ur claims. But u r doing NOTHING
:doh: .... Does MJJC should punish me for it? 
