On the other hand most species of living items have started somewhere and got to the America's over time.
For example, the honey bee:
No Apis species existed in the New World during human times before the introduction of A. mellifera by Europeans.....
Species of Apis are generalist floral visitors, and pollinate a large variety of plants, but by no means all plants. Of all the honey bee species, only A. mellifera has been used extensively for commercial pollination of crops and other plants. The value of these pollination services is commonly measured in the billions of dollars. Bees collect 66 lb of pollen per year per hive.
https://en.wikipedia.org/wiki/Honey_beeSo, while there are species who do great harm to an ecology when they arrive as invaders, not all are that way. The honey bee arrived from Europe. What would we do without them now.
Or several species of raptors, ie, the predatory birds who clean up dead animal remains. DDT just about wiped them out. & you know very well that humans couldn't begin to pick up after life is gone from many critters, plants, etc. How wonderful that there are eagles, falcons, ospreys all over the world.
Unfortunately, I don't know enough to really say what good insects accomplish. No doubt they do some good for our various ecologies. The world doesn't come to an end because insects enter firewood.
:C