I’ve adopted a live-and-let-live policy towards the katydids in our yard. Unlike the swarms of little aphids, there aren’t very many of them and they don’t do much damage, so I tolerate a few chewed up plants in exchange for a few pictures. It’s actually more than a live-and-let-live policy, as when I trim the roses I try to make sure that any katydids on the cut stems make it safely back to the main plant before the stems go in the yard waste bin. The fact that I go to any effort to save the lives of some of my garden pests is probably a sign that I need to see a therapist.
This one preferred the gladiolus over the roses, you can see the holes in the stem it gouged out. The flowers were already spent so it wasn’t hurting anything. I’d usually leave the spent flowers until I was sure they weren’t eating them anymore.