Shills want "alt-right" members to be depressed, nihilistic, downcast, gloomy individuals without any direction in life and without any pursuits in life. For that they keep posting demoralization posts on "alt-right" so to make "alt-right" members feel bad. They were used to make posts on 4chan about supposedly wretched people describing their supposedly wretched situations while passing themselves as "alt-right" members so that "alt-right" people may empathize with the mood that these posts were pretending to transmit so that "alt-right" people may be downcast. Sometimes shills were even used to speak about suicide. They want "alt-right" members to literally commit suicide.
They generally attempt to pass themselves as "alt-right" while pretending to subvert people because people tend to empathize themselves more with people who belong to the same tribe as them, so to speak.
They also attempt to paint being a wretched as a good thing so "alt-right" people may endorse wretchedness. Notice how many memes are there about wretched people such as the "doomer" and how people endorse them as if it was cool to be doomers. That is basically psychological warfare. They use "memetics", "behaviorism" and "pavlovian association" tricks to attempt to subvert people.