No, Brighton is not their backyard.
Well, it's great that you think that, but you know full well what Brighton's reputation is when it comes to LBGTQ ete etc. It has the largest non-straight population in the UK. If it's not their backyard, then they don't have one 🤷🏻♂️
No, they don’t have a reason to be angry.
Unfortunately you don't get to tell people what they can or can't get angry about.
If a violent male gets angry and beats up his wife, does it mean he has a reason and we just don’t agree with him???
Yes? An awful and unjustifiable reason. Almost everything we do happens for a reason, or we wouldn't do it.
Just because those people were violent and vandalised public property, does not mean they have a reason.
Reasons aren't just things you think are morally correct.