It seems like you accept that the Liverpool fans were being idiotic, in which case we're in agreement. You didn't really need to justify their behaviour by same you'd also have been miffed if one of ours had gone to a rival.
What on earth are you on about?
You tried to liken the move to Alexis going to another English club around our level, but that comparison doesn't work because Real Madrid are not another English club. The Liverpool fans who booed him are idiots, and decent Liverpool fans will agree.
Although according to El Pres (whom I'm pretty sure is on the take) Chelsea are sitting pretty re FFP thanks to all sorts of clever accounting (that may or may not give El Pres a boner - it does).
Is Trent going to Manchester? No. So the comparison is if Alexis played for us for years and then went to club with better trophy prospects in Spain. We'd have been ok with it. There's no excuse for Liverpool fans giving him shit. None.