In Europe, in the forest, with or without them - plants, birds, insects and other animals are unaffected.
As for farmfields - there are so many fields there that presence of wild boars is not noticeable.
They used to squeeze through the fence and hide in the grain - but did not eat enough to notice and did not knock down enough stems to notice.
Is this your personal experience? You're stating this like it's fact, but it totally contradicts what everyone else in this thread is saying.
...Why would wild hogs be courteous enough to only eat such a small amount of something that no one would notice? And the farmers whose fields get trampled don't matter, because there are many more fields? What? K I'm gonna steal your car. Shouldn't matter, there are literally millions more, right? Not even a drop in a bucket.