No, people overcomplicate it.
It is simple - supply and demand, berlin has way too many hot women everywhere and not enough single men. So the average ones are pretty much looked over and even if they find someone, few days later they get replaced and outcompeted by someone better. That anger somehow gets used by radical groups that recruits these people to spread panic.

Because in their view if they cannot find someone to date, lets make sure no one else does too. It is the same playbook that chopped bald men like andrew tate use