Is hypocrisy in proponents of a belief actually a good argument against the belief? This reminds me of those arguments that presume if solipsism is true, its pr

Is hypocrisy in proponents of a belief actually a good argument against the belief? This reminds me of those arguments that presume if solipsism is true, its proponents have to act like psychopaths, or that if determinism is true, its proponents have to act apathetic. In every case, if the proponents dutifully performed their beliefs, that would merely indicate they hold the belief, not that it is true.