Loneliness is stronger when not alone
At college there was program where student volunteers would hang around high traffic areas and "cheer people up" by shouting at passersby to tell them they're loved or whatever. Obviously, this only makes actually depressed and lonely students feel worse. It's exactly the kind of thing that someone who'd never felt depressed in their life would come up with, and when I mentioned this to some of the people involved in the program they were absolutely flabbergasted.