There is nothing brave or heretic about holding those views in Silicon Valley. SV skews quite left even though most people's actions don't match words. You'll find a high degree of acceptance of these views at all levels in SV including tech CEOs who worship at the altar of pseudo-socialism.

Sometimes, you will get nuanced pushback (since these are very old ideas), but I've never seen a person cancelled in SV for holding the suburban socialist/communist ideologies that you listed. You are more in danger if being labelled alt-right if you argue against these things.