Your wrong, it is dangerous if just one pool has veto about change thats why 75%, and Gavin asked relevant Bitcoin services whether 28 days is enought time for them to make necessary changes which he received positive responses.
You are wrong. Why not 70%, since a single miner could veto with 26% hashrate? Why not 50% because more miners could veto the change? That could only happen if there was
no consensus obviously.
The community support seems majority as well when you consider all the forums, not just btctalk + r/Bitcoin where it might be closer to 50/50 instead
Wrong. There is no indication that the majority support any contentious HF. If there is, I'd like to see some sources (e.g.
bitcoinocracy shows
one side of the situation).
You are forgetting that the larger portion of Miners are behind the +2Mb bump. Thats what is going to count.