It was obvious, however it was not specific whether or not your statement was regarding the determinant for the ban or an attribute of the banned, which is relevant in this case.
"A property of those banned was that they were all conservative." is not the same as "The people who were banned were treated so as a result of their conservatism."
For people who aren't ignoring the specific situation, we're aware that there's a general accusation of, "Conservatism is getting banned from Twitter!" so in this context your ambiguity is resolved by applying context, which then makes what you tried to point out wrong.
So in this context, saying "only conservatives were banned" can be interpreted to mean, "conservatives were the target of the ban", which is then false, and what I responded to as such.
