I have been mowing over at Peace of Heaven Ranch around the corner from us. As a matter of fact, last week I mowed three times in three days (carefully avoiding the thick patches of passionflower.)
If you think of the insect pests as aliens, and the predators as, well, predators, then I believe it is plain that we have managed to stack the deck in favor of the predators by allowing them to live their lives without the constant fear of death by whirling lawnmower blades and weedeater strings. These predators are repaying the favor by devouring the garden aliens en masse.
Doesn't it just make you want to take that loud, smelly lawnmower or yours to the junkyard? Probably not. But I, for one, will remain ever grateful to our host of garden predators and their weedy homes.