No one is making the charge, at least no reasonable person stormer, that arresting bad guys is criminalizing political dissent.
However you cant be unmindful that a tremendous effort exists inside this admin to conflate dissent with potential violence.
You also cant ignore the fact - though it might be totally coincidental and of no import - that this bust took place at the end of a particularly alarming week considering the efforts by this admin and the dems to cast the right as violence prone Christian wingnuts.