I couldn't care less if Hitler, Stalin, Pol Pot or even Bob Monkhouse[2] were pushing open source patches and contributing talks, as long as they:

- do not turn away from debate - do not turn to or espouse violence[1] - and their contributions were of merit

Since DHH has done none of that then the answer is "yes, it's okay to put him on a stage to talk about tech".

[1] I thank Karl Popper for showing the way here with his Paradox of tolerance.

[2] Bob was the master of self-deprecating jokes, I hope he would appreciate that one.