Of course, the basic question that is the crux of the matter in the confiscation of the 88mm AT gun and the Panther tank, is whether civilians should be allowed to possess items of military hardware at all.
Despite being technically "disabled", they are all capable of rapidly being returned to fully operational wartime status (in secret), with the potential for disastrous results in the hands of someone pyschologically unstable.
With an ever-increasing number of people suffering from mental instability via drug use, overwhelming but unbalanced feelings of personal injustice, and marginalisation, it doesn't take much to tip some people over the edge.
I would be a little nervous about any neighbour of mine who was becoming more irrational by the day, at the same time as he was going on a military hardware collection binge.