This power could be used to sensor you in the future. This power could be put in the hands of a group of people who thinks completely different from you.
In this case, Twitter et al. thought a LOT about what to do, as they did very little for 4 year's of Trump's presidency, and only decided to act after Trump incited a literal self-coup and insurrection with the goal of illegitimately keeping himself in power.
If in the future "those who think completely differently from me" are going to think liberal ideas are so dangerous to be removed, it won't matter what "standard" we set today. It seems even with the highest standard of "don't support open coups", you still think I will be judged the exact same.
Censorship is bad. But insurrections against legitimate governments are worse.