It's human nature. If someone disagrees with you, they're evil and you should kill them. You should destroy their writings. You should shut them up at all costs. If you're good enough at it, nobody will know what they stood for in the first place.
One example is the medieval church. I'm a Christian and I'm fine with doctrinal purity, but the church went to extremes in the old days. We only know about a lot of heresies from books arguing against them. People destroyed heretical books. During the Protestant Reformation the church/government killed reformers. For years Christians oppressed Jews, even tho Jesus and His first disciples were all Jewish.
Oppressive governments do the same thing. The Nazis and Communists killed lots of people for disagreeing with the party. Not for doing anything. They killed people for other reasons too. Nazis hated Jews, homosexuals, Jehovah's Witnesses, and a bunch of other groups. They didn't do anything to the Nazis apart from existing.
We don't kill people or destroy their books any more in the Western world. Now we insult people, call them names, make fun of them, etc. It may not kill people but it hurts their careers. Here's a form of oppression in the music world:
Most rock critics praise genres like rockabilly, garage rock, 70's punk, post-punk, and early alternative. They trash genres like progressive rock and metal that don't fit their narrow view of rock.
When I was younger I didn't like progressive rock apart from Pink Floyd because things I read told me not to. People said it was "pretentious" and "self-indulgent" and it "violated the spirit of rock'n'roll". Then I discovered Procol Harum, who led me to Yes, who got me hooked on other progressive rock like King Crimson, early Genesis, Dream Theater, etc. Now I know rock critics are full of crap because those bands made great music. In the standard history of rock, punk "destroyed" progressive rock, like how grunge "destroyed" glam metal. Progressive rock bands and glam metal bands didn't do anything to offend punk and grunge bands. The rock purists killed the rock heretics in a heroic act to restore standard forms of rock.
Disco had a worse backlash from rock fans in the late 70s. There was a disco record demolition in 1979. That's real oppression.
I'm not the only one who sees a connection. John McFerrin says "I like a lot of punk rock and post-punk, but the punk "revolution" was really an inquisition." Nile Rodgers from disco/funk band Chic compared the anti-disco movement to Nazi book-burning.
The worst part is most rock critics hate religion. They embrace rock music like it's an alternative to religion that lets them do whatever they want. They probably say "religion kills so avoid it" like most anti-religious people do. But they still got the "kill the heretic" instinct because it's human nature.