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Defacing art is its own form of artwork; whether something is art or not is entirely subjective
ca c'est n'est pas un pipe
This premise is art.
It is a digital text, not a pipe. It's not even the depiction of a pipe.
It contains the word "pipe" which is per definition a "pipe".
If you think pipes are art, then pipes are art.
Defining 'art' conclusively is functionally extremely problematic, or arbitrary. There are certainly, however, things called 'art'. Therefore we can only argue about 'things called art', which are objects.
Art could be defined as anything involving an enacted effort, either by human or nature.
Art is personal property. We should not destroy or damage others' personal property, therefore we should not deface art. Unless you own it. Then do what you want.
You can still deface your personal property!
Not all art is private property. This argument only applies to private property art and not all art.
There is public and private property. Public property is still not yours to destroy. You can't go pulling up roads and claiming that they're yours so you can do what you like with them.
There are still forms of art that do not fall under public or private property, such as a painting on the side of a mountain.
I never mentioned legality or ethics or not, but, yes, destroying or modifying someone else's property without their prior consent is something that people shouldn't do.
Even though you never mentioned the legality or ethics of defacing art, the notion of ones right to their personal property is a valid concern.
A piece of art should not be defaced if it results in the destruction or loss of the original art.
You could be losing the original intent of the artist, lose a potential source of inspiration for artists in the future, as well as a record of our artistic history.
Art demands reaction.
It is not necessary for "reaction" to involve the destruction of property.
Art, unless never so claimed, is property, and therefore defacing it is vandalism.
If no one claims it, then this would not be a problem.