I've never been to a Pride because I'm pansexual and I've heard even pans get treated poorly by both heteros and non-heteros.<<<as a lesbian I promise I love you as much as any other human. My two best friends are pan.
Whilst I agree this is an octopus the hydra symbol has been rotated over many years and I also believe it's called hydra based off their motto cut one off and two more shall rise to replace it but still Hail Octopus lol
I think it's because they were brave to the point of OMFG NO THAT'S A TERRIBLE IDEA all the time. It took guts to do what they did, and most Slytherin won't spend their lifetime supply on fireworks if it doesn't benefit them the most