With good decision making from him, we win 3-2
get 1 point ahead Madrid
Or if Lucho would field a better lineup or if Suarez, Ney, midfielders,... would play better we would also get 3 points. We can go on with that what IF game forever. Yes, MATS made a costly mistake but everyone else played like s.... in 1st half as well so while your statement is true in some extent it's also unfairly to blame just MATS for loss.
It's easy to blame individuals but I believe that we win (although we can win some games because of individual quality) and lose as a team. Because 99% of times when we lose more than just one player underperform/make costly mistakes. We have enough quality to win games even if 2, 3 or even 4 players don't have a good day. But when 7 or 9 of them are underpeforming it's hard to win against any team. So I blame the whole team (with maybe one or two players who get a pass because they at least show something when the whole team is bad) and Lucho when that happens. For Celta game only Pique, Iniesta and Denis get a positive grade from me, but even they can play better.
I disagree. I think supporting him when he's made boneheaded mistakes like he has will only give him confidence to do it again. The lob heard around the world clearly didn't deter him from being an asshole so it's right he here's the jeers for a while. All he needs to do is play it simple in the back. Distribute and stop trying to be cute. It's okay to play dangerously once in a while when he's earned his stripes but he's not a vet to be doing the shit he does. See Busquets.
I think you've mistaken criticising him (which we absolutely can do when he deserves that) with supporting him. Maybe I'm naive but I believe every Barça fan should support every player that wears our shirt until they deserve that. I'm not talking about (lack of) quality because it's usually not players fault that they are here when they possibly shouldn't be because they are just not good enough (anymore). So until players show effort and play the best they can and until they don't do things that harm the team/club (mostly off the field) or they don't trait us like Judas Figo I will support all of them. That doesn't mean I won't admit when they've made a mistake or play bad. I've done that with my all time favourite players like Puyol, Xavi, Iniesta and Messi when they played bad so I'll do that with all other players too. But at the same time I won't stop supporting them, especially when players will go through a bad period of form and will need our support.
MATS costed us some points but so have all other players that have ever played for us at some point in their careers. But he has also showed us before that he has quality to play here and also saved us some games. So again, I think MATS deserves to be criticised for his mistakes but he also deserves our support (and I think he'll get that except for some hardcore Bravo fans who for whatever reason still blame MATS for Bravo's personal decision to leave) at the same time. I don't believe that support "will give him confidence to do it again" like you said. He knows he made a mistake and he's probably still mad at himself for that. But he's a strong personality (like VV before him) and that's one of the things you absolutely need to have as Barça player (and especially GK) and will need to put that mistake behind him as quick as possible.
He won't change the way he plays (because that would also mean Barça in general would change the way we play) and he'll most likely make some mistakes again but it's just the way we play. High risk, high reward. Sometimes his bad passes will put us in uncomfortable position but most of the times MATS passing skills are a great benefit for us, especially against teams that pressure high. I probably don't have to explain to Barça fans why that's important.