It was a reference...if you played that game, you also know how he ended up due to the path he took to eliminate strife.
Yes, tolerance would be greatly appreciated, but it's not (always) a very easy thing to maintain. You kinda asked for the social equivalent of "world peace": in theory it sounds beautiful, but in practice it's kind of impossible to do.
Tolerance takes effort, and with personal insecurities, stress and all kinds of stuff wearing someone down, one might be less motivated to be tolerant, or even more incentivised to polarize themselves towards the other (see twitter for shining examples), especially if the latter comes combined with (mainly social) benefits.
For example: take the quote above. I didn't have the implication to insult people, but simply to make a relevant reference (however stupidly placed) . I apologize if things came over like that, my sense of humor is something I personally make fun of (in which I also fail for the most time). But the reaction wasn't entirely tolerant, either. There was a slight sense of volatility in the formulation (or at least it came off to me like that).
This is in no way a justification to be intolerant (or intolerable). It's that you can't just ask people to change, people need to want to change in order for it to happen, and people can be/are stubborn.