I saw those, I was going to ask if they were "nice".

Be careful with those, Although I wouldn't want to steal someone else's, I am always looking to see if I can discern whether it is "nice" or not, to learn more about my neighbors.

Obviously having them on your front steps is giving them too much attention.
Just like putting a weed plant on your front steps. It's like Here, Look at my entrance, Look at What It Means, See This Cactus. Anyone with enough sense of psychedelic plants is going to be able to recognize those.

If you wanted, you could unconditionally love and accept and value this expirience, and the choice the person made to steal it. You could think of it as a learning expirience. They didn't teach you anything, you taught yourself.
They grow fast though, so no worries