What does "them" refer to?

What does "them" refer to? "Those people"?

Context:

He is among signatories of a letter to the UN criticizing the http://en.wikipedia.org/wiki/Intergovernmental_Panel_on_Climate_Change^{http://en.wikipedia.org/wiki/Freeman_Dyson#cite_note-45http://en.wikipedia.org/wiki/Freeman_Dyson#cite_note-wiggles-46} and has also argued against ostracizing scientists whose views depart from the acknowledged mainstream of http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_change, stating that "heretics" have historically been an important force in driving scientific progress. "[H]eretics who question the dogmas are needed ... I am proud to be a heretic. The world always needs heretics to challenge the prevailing orthodoxies."^{http://en.wikipedia.org/wiki/Freeman_Dyson#cite_note-heretic-44}
Dyson says his views on global warming have been strongly criticized. In reply, he notes that "[m]y objections to the global warming propaganda are not so much over the technical facts, about which I do not know much, but it’s rather against the way those people behave and the kind of intolerance to criticism that a lot of them have."^{http://en.wikipedia.org/wiki/Freeman_Dyson#cite_note-e360-47}