I obviously can't respond to every point here, so just to pick a couple -
No - but I never said you did? I likened your defence of Bazunu (the defence's fault, the keeper couldn't have done much about the goals, not getting much protection, etc) to the defence of Travers we saw (from other posters, though I didn't think I needed to be that explicit) when Bournemouth lost 9-0 to Liverpool.
I think the "young" bit gets overemphasised tbh. Yes, he's 21 and learning the game, improving, etc (as I've regularly acknowledged and have no problems doing so again). But he's playing senior football; he has to be able to be judged against it.
I mean, fair enough, but in judging a keeper I'm not sure why you'd leave out the entire of last season. But let's roll with it.
This doesn't make any sense. Of course it's not Bazunu's fault that the defence allows shots on target (we'll overlook your comment later about Begovic maybe organising his defence better; it's a minor point in the scheme of things. And the same to your later point about who's to blame for too many long-range shots.
He's not there to stop shots being taken; he's there to stop the ball going into the net. And he's not doing that. Those long-range shots, for example, weren't all 100% unstoppable.
So when you come to looking at the 12 goals and asking which he was at fault for - I think this is too vague a question really. If each of those shots is an 83% chance of a goal and he saves none, then he's not really at fault for any of them but he still should, on balance, have been expected to save two. (I know this is a confirmation bias to an extent as I'm ignoring the shots he saved; it's just for illustration). It might have taken great saves to stop two - but then that's what he's there for, isn't it? And it's a common criticism from (ranty) Southampton that he rarely seems to make a great save, to keep them in the game. And this is another advantage of stats over human observation - not just independence, but the accumulation of lots of little bits of data, which can lead to the idea that even though he's not necessarily at fault for any (except the third v Sunderland, let's say), he's still not done well to let them all in.
If you do want to have a look at the ones he may have been more likely to save - first off I think most people here feel he was at fault for the third against Sunderland; you can't get that much of a hand on the ball and not keep it out. I don't think it's a howler as originally suggested, but it's weak keeping. There's question marks around whether he could have done better for the second (my view) or the fifth (your view). He doesn't exactly make himself big for the opener against Norwich. And then there's others - like the fourth against Norwich and the fourth against Sunderland - which are brain farts from the defence leaving him hung out to dry.
Nope - I didn't watch the video. In general, I don't care what managers say in public about a player; there's always some choreographing going on. Is Martin trying to get the fans to back the keeper? Is he trying to defend the club's €15m outlay? Is he an idiot? Is he right? I don't know - and as I say, don't really care. That's not just convenience here; I generally don't care what any manager has to say in public.