Because this is about something he _did_ not something he thinks?
> It is the job of the Thought Police to uncover and punish thoughtcrime and thought-criminals.
> thoughtcrime is the criminal act of holding unspoken beliefs or doubts that oppose or question the ruling party
Note the unspoken part of that definition. Eich took steps, actual steps, not even just speech, to limit the rights of other people. That's why it's not thought police.
Treating people with less dignity than someone else is a _huge_ thing, this isn't just a petty political issue. The Mozilla community, a private group of individuals, raise many concerns that someone willing to limit the dignity afforded to certain groups of people through actual actions that person has taken was not fit to be the head of their organization. How is that thoughtpolice
EDIT: Downvotes without comments do so much to move the conversation forward, thanks!