I only call breaking boundaries heresy if you're really horrified to even think of doing it and reflexively want to repent, like ( I'm assuming) a really religious person feels at destroying their symbols or how Germans feel at the thought of swastikas or how some fictional people feel at saying voldemort. I guess taboo is the way better word actually. Not that those should all be broken of course for example putting on nazi uniforms will definitely lead to people getting hurt. But illogical personal taboos should.
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