There are arguments both ways as to whether Bellerin was fouled, however one thing is

[World's End Stella]

I would suggest that if you knock someone unconcious, by default that's dangerous play and therefore a foul and a card

Well, strictly speaking that isn't true though, is it? You can knock a player unconscious and it could be his foul. Equally, you could not even touch another player and be sent off for intent.

Sometimes contact is going to happen, there are 20 people running around out there. I saw the replay multiple times and was still undecided. Two players jumped for the ball, one a little higher than the other, they came together, both were trying to play the ball, the contact did not look deliberate to me.

As I said, you could make an argument either way. As many are. Danny Mills is unquestionably a c*nt, though.