Murals, art or not?

Unlike previous posts, this post I want to dedicate to other artists, creators, a different kind of art in relation to the one I deal with. I'm one of those people who draws on paper, canvas, cardboard ... and this is a bit of a "harder" kind of art ... drawing on buildings, walls. Yes, you know, it's about murals. Many will say that drawing murals isn't an art and that it is something that makes the city uglier, however, I think it can be seen from the other side. Yes, I agree that drawing like this is often abused by writing ugly messages, drawing inappropriate thinga... however, there are so many other, beautiful things around us, where we stop and admire them. If murals have a positive effect on people, sending some funny, interesting messages or even some love messages, where is the problem? If they are in an adequate place, with an adequate message, they too can very well be considered art. For this post, I have singled out a few murals, some that are like to much, but some are those that are less visible. I can't wait to hear your opinion. :)