Yep! Once you think of yourself as believing the "right things", and that that makes you incapable of doing anything wrong, you will end up doing all of the worst things you can imagine. The only way you can be sure you're not doing terrible things is by constantly asking yourself if you're doing the right thing, and always understanding that you're capable of evil.
The way certain progressive movements ended up so suddenly turning into reactionary movements is because those movements decided at some point that they're incapable of wrongdoing because of what they believe. The progressive movements that avoid becoming reactionary are the progressive movements that understand they're always still capable of doing bad things.