I mean this not a Carlo, Tessio or Paulie situation where they deliberately turned on the Corleones to cause ann assassination. It’s pretty clear Fredo thought he was helping and at the same time he wanted to show he was capable. Was it stupid.? Of course but it was established that he was stupid. However many people also say that Fredo had a good heart including Mike. I think some tend to want to make a conspiracy theory that Fredo maliciously tried to kill Mike but when I look at the evidence I don’t see that. I know some will be up the Senate lawyer as evidence that Fredo was trying to get rid of Mike but at the end of the day he still told Mike about it which he could’ve easily kept quiet about he he wanted Mike to rot in jail. I’m not saying Fredo was an Angel or that he didn’t make a mistake but did he deserve to be killed? I don’t think so