Evo-dilution

If evolution really is the answer to everything according to science, then why do people go out of their way to stop it?

Any time a non-native plant or animal is introduced to a system, and starts running rampant, reproducing like crazy and pushing out all the other species, scientists go into a frenzy trying to erradicate the animal or introduce natural enemies in order to even things out. If that's what it takes to keep the planet from being overrun by one type of animal, then how did things ever just "work out" on their own? Should the scientists instead be saying things like; "it's normal, let's see how evolution fixes things", and "no need to worry, evolution will balance things out in the end".

You could argue that plants and animals have the capability to get a lot farther from home now than they used to in much less time, but once again, if evolution was truly the answer to everything, then I have to belive that it would eventually work out for the best and a balance would be achieved.

Scientists don't, however, which begs the question. What do you really believe? If these systems are so delicate that they can't solve their own problems, then how are there still so many diverse species around the globe?

The only thing I can think of is that "someone" must have planned it that way.