On the one hand - before it has been sold? Illegal, yes. But perhaps not entirely morally wrong.
On the other hand - once someone else owns it? That bar gets a lot higher. Ya gotta confirm whether or not that person is an open member of the white-supremacy group Diagolon or something like that before you do more than finger-paint the dirt on the body.
On the gripping hand - finger-painting the dirt on the body is never not funny so long as it’s fine dirt/dust and you don’t scratch the paint job doing it. It’s harmless so long as it can be 100% fully erased with water and some mild soap.
Just wait until the conservatives get into power. Why else do you think that PeePee is looking at America and furiously taking how-to notes? The entire party is no different from the Republicans.