I wonder how that works with the Hindu community? They often paint swastikas on their doorsteps during Diwali.
There isn't a very big Hindu community in Germany, about 0.01%. They may just use another symbol.
[ETA] I don't know if being reversed makes a difference, not least because the chumps who tend to graffiti them don't know which way it goes anyway.
I saw one scribbled in a lift in Tübingen on the way to work last week, and it was gone by the time I went home. This is in a railway station DB hasn't repainted in at least 15 years: it is still taken very seriously here.