If you are destroying seedlings, though, make sure that it is YOU that destroys them.
Several years ago, we had a landscaping crew in our garden. I was getting rid of some registered daylily cultivars, and also throwing out seedlings. The crew was given the registered cultivars (if they wanted them), but not the seedlings... but I made the mistake of telling the boss that I was getting rid of the seedlings, and he thought that it was okay for his crew to take those, too! And they did!
(I had to try to politely explain why this was unacceptable.)
Needless to say, even though I have a little weekly garden help, since then I have been careful to destroy any seedlings myself.