yes, it would help them find out more about what happened. Especially if there were no trial. if there is no trial and murray plea-bargains, what really happened might never be known. i think the family deserves to know, and we do, as well? I think at this point, a plea-bargain is likely. At a wrongful death civil case, murray would no doubt be required to testify. Or, he could pay a settlement. But where would he get the money? It would be huge.
Also, most likely a wrongful death suit would include aeg. Regardless of what is said about what doctor michael did or did not want, there is every indication that aeg was, or was to be, murray's official employer. remember, they agreed to pay murray a lot? if aeg were the employer (and i think this can be proven), then they're the ones with the deep pockets in terms of a settlement.
Primarily, though, a civil suit would be to give michael his day in court, especially if murray takes a plea and there is no trial. Doesn't michael deserve that? Of course he does!