So the threat of violence against a non violent protest resulted in the non violent protestors being labeled terrorist and justified all the action that followed?
95dB air-horn for 16 to 20 hours per day is not non-violent.
How close do you have to be for it to be 95dB?
A quick search shows 120dB at 1m isn't abnormal for a truck air horn. A line of them from far enough away will decrease in level by 3dB per doubling of distance. 8 doublings would make it ~96dB at 256m.