I’ve seen graffiti art that definitely improved grey ugly walls and barriers. I’ve also seen ugly tags that are nothing more than letters. It’s relative
Let me just put it this way, do I get to just move into your home and take it over simply because I believe that I can make it a better home than you can? Do I get to steal your car/property because I believe I can make better use of it?
Stop rationalizing narcissistic behavior and people trying to impose themselves on others. It’s not relative at all. You or the narcissistic graffiti vandals have no right to impose themselves on others.
For whatever reasons, Germany is rather lenient towards graffiti artists which, in my eyes, makes Berlin more enjoyable than it would be otherwise.
I've lived in a lot of places and I've learned that I hate grey boring walls a lot, I much prefer it when they're covered by colorful graffitis. It seems I'm not the only one so some localities tend to be rather lenient towards graffiti artists and even invite them, other places are much stricter and so you can enjoy bleak concrete walls unblemished by any graffitis.
As to your example about homes, well, in France and in some other European countries, in the 90s there was a bit of a left leaning political push for "right to lodgings". This movement made squatting much easier (in France, it was extremely difficult to get rid of squatters if they moved in past 48 hours). I've always personally thought those laws were stupid and they were eventually repealed and amended recently. But that's the way it is with governments, you don't get to agree with all the decisions made. If it's a democracy you have some measures of influence.
People who pretend to make art on walls are absolute minority compared to those who'd prefer to keep walls clean, or painted, or whatever (there are plenty of options between gray, and wannabe artists spraying smileys). But somehow you offer the majority to leave. I don't think that's how it can work really
