Grenier did not say anything remotely resembling, "We should hunt down pro-Trump Americans as we hunted down al-Qaeda members". Those are Spencer's words. Dishonesty like this is why JihadWatch is at best a dubious information source.
No, but what I quoted up thread is cause for concern in a world where mere ideation of violence, where disagreement or suggestion of impropriety is deemed "violence", with all the projection of mindset the Left can muster. There is only one reason to cut some from the herd, to isolate them, and it is usually to take them to slaughter. There have been physical attacks by non governmental agents, and this has met no resistance from those who are in a position to mount official countermeasures.
The violent individuals mentioned are certainly NOT those Marxists and fellow travelers who destroyed and killed this past year, but the (false flag? and certainly grossly exaggerated) violent acts of a single afternoon in Washington D.C., and not those by the Marxists. The disproportionate difference in reaction to events spells it out. Those whose political stance is in disfavor with those of the current regime would be foolish to ignore the potential for peril.
After silencing dissent through censorship from social media platforms fails, and it will, the Left will grow only more shrill and desperate to silence opposition.
The underlings of the Left's social media have been voicing this for some time, with talk of "reeducation" and "elimination", and after the events of last summer (ongoing in places), I will take their flights of fancy at face value as telegraphed intent.