My answer, ake, would be that in our countries we don't make societies illegal because we dislike or disagree with them or find them distasteful. We even tolerate a limited degree of illegality because there are idiots in any group and they don't necessarily represent the whole. When, on the other hand the level of illegal behavour appears to be such that the group is promoting it, then we consider banning it.

Hence that Clinton or Obama didnt ban these groups is not important. What matters is whether today the groups are encouraging law breaking.