David Duke probably thinks "the system" is rigged against him too... and if you include private institutions in your definition of 'the system' it is and should be. If you hold reprehensible views (though technically legal), then society punishes you. As it has every right to. Trump will complain no matter what, that has zero weight. When someone who cries wolf like Trump isn't complaining, then something is terribly wrong.

> Shouldn't individuals have a right to have terrible opinions?

Yes. And society at large has every right to punish and socially ostracize these who hold abhorrent views.

I feel like technically minded people get mixed up between "we withhold from the government - the institution in our lives with absolute power - the right to silence citizens" and "we expect the private companies/organizations we support to use their influence to better society, not ruin it."

No one is disputing Thiel's right to have terrible opinions, a right he exercises with gusto.