> It's not a stretch that a militant person from Hamburg would also be a fan of this club. That's about it and how it probably ended up on that list.

I am far away from accusing either the club or its fans as potential threats.

It's just as you said: There is a visible overlap, this pirate flag ended on that list and that's it. The list we're talking about even puts not ban on that sign. It's just connects it to that milieu and that's it.