IIRC, German laws are already pretty restrictive concerning Paintball as a whole. You need to be 18 or older to buy a gun, games can only take place in dedicated areas. Back in 2000, there was a study trying to determine whether playing paintball has any effect on the players social interactions (predictably, it came up negative).
This is again a case of legislators not knowing anything about the things they're trying to legislate, and believing in the existence of acceptable targets.
There is also an ugly thing called "Wehrsportgruppen" around here, Germany's equivalent of the US' crazy right-wing militias, and to the uninformed, there are at least some paralles between the two.