So you live in Germany? I would say it’s important to for the government to fund memorials of atrocities if the government was responsible for them, even if it’s an entirely new government.
A lot of musea covering the many atrocities in East Germany have already disappeared. And even in the Berlin wall museum the reminders that the last leftists to rule there shot (many) people for the crime of trying to leave socialist utopia. In most Universities the academic victims of Soviet rule aren't remembered anymore.
So this is not a theoretical concern.