And the insurrection was planned more on FB than Parler. The FB app is still in the app stores.
FB tries to moderate the violent comments, Parler did not.
But its clear the reason they're treated different is because Parler took a black and white stance and FB is a value judgement and much harder to criticize.
Parler is just very explicit about this intention, where as Facebook wants you to believe something different but actually only behaves differently as little as needs to maintain the illusion.
In this case, I respect Parler slightly more because at least they're upfront about it. Both are scum and both should go, but at least one is honest about their intentions.
Parler also happens to cater to a common enemy with no political ties or PR appeal, where as Facebook gives you the illusion of being the good guy, all while making money off the same people Parler wants to cater to.
To me, it looks like they selectively moderate the views that give them bad press (ISIS) and enjoy the massive engagement that comes from the conflict.