> In Germany we have rules, and one of those rules is that pedestrians on the sidewalk who are in the cyclepath (usually a too-subtle red stone) do, in fact, have to get out of the way for cyclists.

Yeah that's the problem, it's often too subtle and hard to notice.

That's why bike lanes should be dedicated with a stone barrier/kerb, or bikes should just not be allowed there.

I am quite often in Germany.

Red stone in Germany is cycling path, not general walk path where cyclists are not allowed.

Air horns are generally allowed upto 105 dB. Peper spray, telescopic batons and other similar devices are illegal. I also carry walking cane.