Invaders vs invasive

Suddenly, I'm seeing these beautiful bugs on my butterfly milkweed.  They're everywhere on it, crawling all over the seedpods I've been watching, hoping for seeds to extend my milkweed patch.  It turns out they're Milkweed bugs (see here).  They don't hurt the plant.  They don't damage any monarch eggs.  Their sole purpose is to destroy the seeds of the milkweed.  In nature, that keeps the potentially invasive milkweed seeds from spreading everywhere.  I hope they leave enough for me.