Playground trespass!

So yesterday hubby was leaving and he called to say the people down
the street ( that we do not know ) we using out neighbors playset
( which they have been asked not to do ). Well I had to leave the
house 2 min later and guess what? They were in OUR playset!

I stormed out there telling ( not yelling. Not rudely. ) them to get
off!

And the dad was all "sorry! Sorry!" ( they are Pakistani ), I said
"no! Please GET OFF!".

They waited til they thought we were not home to trespass, so they
know we wouldn't like it. What us wrong with them?

And FYI, they are currently having their basement finished, so they
could have bought a set if they wanted.