Presidents read off of a teleprompter for speeches, does that make them a mess too? Matt didn't write these songs and probably hadn't had to memorize another band's whole catalog until recent years.
This is extremely hard to believe. Just sounds like you making up something to make yourself seem right.
Right back at you. If you were being told you're doing something wrong in front of your fans you'd probably get more pressure internally to get it right and every mistake afterwards would increase that pressure.
I know Matt made a few mistakes throughout the show when I was there but that didn't prevent me from having a good time. I still got to hear one of my favorite albums in full for the first time and had a blast.