The Left are so emboldened because not only are their views supported (mostly) by the media, education establishment and much of government in the USA, they rarely face financial or professional retribution and never face physical retribution. It gives them a false sense of self-righteousness.
Imagine if he feared chickens coming home to roost on him, while he sat in his parked car. He would not say the things he is saying.
They are emboldened because they realize they are losing. It is a last push...it will fail.