This is an interesting case for the 2nd Amd. In Europe, the local Germans have no means of defense. Any group of 20+ Muslim men who pick up pieces of rebar are the instant masters of the terrain. They already outnumber German men in their 20s in key districts. Fire bombs in future refugee centers are glitzy, but don’t get rid of one single invader. Only guns can stop busloads of invaders from being sent to any given village.
As it stands now, who is more likely to already have a cache of firearms in Germany (besides the Polizei) - the local volk or the mosques? We all know the answer.
Fire bombs in refugee centers might make for headline-grabbing protest, but are ineffective at eliminating threats.
Other forms of resistance may apply including but hardly limited to burning buses, well-placed construction/demolition explosives, group response with cudgels and other implements of blunt force or slashing trauma (which takes a minimum of numerical parity or effective ambush to anticipate any success), and numerous inventive and possibly effective and lethal means but firearms are the best defense.
Kristalnacht was also glitzy, but didn't get rid of one single Jew.
It's a means of propaganda and of stirring up the masses to your cause.