Should Graffiti Be Protected?

I think graffiti should be protected. Graffiti is a form of art and expresses the feelings of an artist. This type of art is beautiful and has different meanings to it. Opinions are expressed to different politics and events happening. People need to a way to share their thoughts on different matters, and art is the best way. I do think there should be restrictions to it. Graffiti should not be on private property. People wouldn't like it to find graffiti on their nice houses or buildings. We are still respecting graffiti but putting a restriction on where it should be painted. Different artists and their pieces can also get famous. For example, the Banksy is a famous artist that creates street art through dark humour with stenciling technique. Artworks can get popular and be known to many people around the world. Graffiti should be protected because it expresses people's opinions and stories

some pics to illustrate ?