Most tick bites are painless and cause only minor signs and symptoms, such as a change in skin color, swelling, or a sore on the skin. But some ticks transmit bacteria that cause illnesses like Lyme disease.
Bedbugs are like a plague, and they have no redeemable virtues. One user said, “I am currently spending thousands of dollars and countless hours of labor on getting them out of my house. And don't get me started on the bites and itching.”
The spotted lanternfly kills most trees and flowering vines, extensively damages fruit and berry trees and shrubs, and can kill many food crops. While it is rather pretty, this bug doesn't seem to serve any other purpose.