Peter Thiel is no more dangerous that Sundar Pichai, Mark Zuckerberg or your average tech CEO.
I also have a problem with calling speech "dangerous".
Why can't we just call them stupid? Or malevolent even? "Dangerous", to me, suggests they're Hitler (/ Stalin / your circle's bad person du jour) incarnate. You can disagree with someone vehemently without all the vitriol and fearmongering.