Well, the list so far appears to be:
1) "That's not journalism he was rude!" - Generally from people in the USA who don't seem to have journalists with spines.
2) "But he made dungeon Keeper 18 years ago and I loved that game!" - Ignoring the fact he hasn't made anything since and past glories dont excuse present con tricks (and the fact he had an entire team behind him - no one man makes a game).
3) "He went downhill with Fable but look at his earlier stuff, its amazing!" - Ignoring the fact he's been doing this con trick since the days of Populous.
4) "Gaming needs visionaries and dreamers" - Ignoring the fact gaming is in a better state now than it has been for decades and every day people are actually delivering on promises. through kickstarter, the indie scene etc.
5) "He always overpromises, it's PM, but he doesn't lie" - ignoring the *actual interview* where he admits to lying, the Milo video, quotes from his own mouth etc etc
6) subset: "It's kickstarter, people shouldn't expect what they pay for" - that one is just beyond me. Admits to lying for his kick starter several times, apparently thats okay!
7) "Development is hard, you always slip dates and things take longer, the journalist just showed how little they understand by questioning that" - gnoring PMs 30 year track record of doing this con every single time, and the fact that 2+ years is a lot more than a slipped date, AND the fact we know they never intended to deliver on what they promised in the first place - from PMs own mouth.
It's not comprehensive, but that's a fair list to start. Honestly, sometimes it reminds me of the article a few weeks ago about why people don't believe contradictory evidence when presented to them. The more you present evidence they are wrong, the more they double down on their initial beliefs. I don't think people want to admit that the guy who was involved in such amazing games from their younger years was actually a con artist all along, and has now been caught literally defrauding people. It's shatters some illusions people seem to prefer to have.
Personally, the biggest tragedy is actually all the people at Bullfrog who were clearly responsible for the brilliance of those earlier games, and instead gaming history seems to have gone down that it was PM from start to finish on them.
(Oh, and the people who had money stolen from the kickstarter, or the poor guy who won curiosity. But see above, apparently they had what was coming to them and it's their own fault!)