It isn't difficult to identify some "stupidity" in most any ideology, but managing to get a member of an ideology to acknowledge that it is true/relevant/etc is

It isn't difficult to identify some "stupidity" in most any ideology, but managing to get a member of an ideology to acknowledge that it is true/relevant/etc is extremely difficult. I suspect some much better approach is out there, but we seem to not have found it (perhaps because we aren't really trying to find it).