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Fart spray and glitter are temporary and relatively harmless. Permanent dye in someone's home are car is just being a jerk.

so is stealing a package off someones porch

I certainly don't deny that.

Personally, I'm still not going to perma-dye someone's car.

We sure wouldn't want to upset people stealing our belongings.

One other issue is: they're criminals, they know where they got the package from and now they're pissed.

I won't deny the criminality. I'm still not going to cause them thousands of dollars in damage over it.

Use UV active dye (usually transparent otherwise) so they get shiny. Say, a package gets wet itself.