If all else fails, use dev mode and destroy. But, there should be a non-dev mode way to destroy it...

Have you tried burning it? That might work. Area of effect spells?

If you don't have a weapon you can ground target to destroy the trap then you can always set up enough traps elsewhere until it removes the trap in your base, You have a cap on how many trap each ranger can set and it will automatically destroy the oldest if you exceed that number.

I'll see about adding a "destroy trap" button.

@GoodNameIdea I did eventually get rid of it by having an unwanted colonist walk over it. I warned him what would happen if he didn't stop being a pyromaniac.

@Torann Gotcha. Just to be clear though, this was an enemy trap. I have no rangers around to put down traps. :-/