>It's strange that they picked such a poor way to justify the ban when they could have made a significantly stronger case, and in doing so could have convinced millions more people that they are trying their best to apply policies evenly.

It's clear that people are trying to make this into a cultural moment where you either distance from / renounce Trump (which is almost costless given the immanency of his term's end) or you're treated as an unrepentant enemy of civil society. We're seeing pro-Trump hubs being systematically purged in various ways from a variety of platforms right now, and the symbolic value of moves like this is what's paramount.