Found these guys going to town on a few leafs on my Columnar Aspens

These gonna destroy my trees if I don’t deal with them?

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Your tree is providing habitat value. Congrats.
- Not all bugs are beneficial though.
  
  If they're invasive yeah nuke em. Otherwise you're good.
Are they on the leaves, or at the juncture of branches? Leaves, fall webworms, branches, tent caterpillars.

Looks like webworms. They usually defoliate small areas of a tree. If it's healthy it shouldn't be a problem, it won't look nice though.

There are some predatory wasps that eat or parasitize them.
inaturalist is pretty good at identifying caterpillars (among many others). It has a well designed app and the community too is really helpful
Maybe fall webworms?
- Hrmm, I didn’t see any webs, but it’s good to know they aren’t bad for the tree if that’s what they are.
  
  I’ll try and get a better picture and see if my phone can identify them.

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