The nice thing is that in democracies you can influence what is done against graffitis. Don't like graffitis? try to push your local representatives etc to be stricter on them or move to a country that has no graffiti like Singapore. One of the most sterile, boring city in the world.
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 I've always personally thought those laws were stupid and they were eventually repealed and amended recently.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.
