Unpopular opinion: I find simple tagging and non-obscene graffiti in general less offensive than the spam flyers and company logo/QR code stickers everyone sticks everywhere. At least where I live the latter is also way more common.

If you spray graffiti on public walls and get caught, then the punishment should be to pay for it and additionally police should come to those people’s home and spray everything there with graffiti. The books, the furniture, the clothing, the television, the walls, the windows, all their personal belongings. This would maybe teach them a lesson to respect other people’s belongings 😊