Currently there are lots of people who claim to be Liertarian but aren't. E.g. conservatives that want big government and more government intervention and more police and less freedom of speech such as book banning. There are neoliberals that are vaguely for less government in all aspects but will never go far enough to question the exsistence of institutions. There are even literal commies and socialists that think anarchism would be socialist.

You can't stop people having these opinions. But you need a clear message where libertarian ideology begins & ends and where there are freeriders