Please note that the Canadian government has, in the past, on multiple occasions [0], used agents provocateurs to falsely smear a protest movement by planting their own agents who attempt to inflame a situation. For example, trying to turn peaceful protests violent.
To my knowledge, there was a singular incident of Nazi flag on the very first day of a 25 day protest. There is also some evidence that it may have actually been the PM's personal photographer who took the photos of the Nazi flag [1].
It is also a curious fact that this flag incident took place at the Fairmont Chateau Laurier, a $300/night luxury hotel in the heart of Ottawa, known for hosting foreign dignitaries and heads of state, that now curiously houses a large contingent of police from all over Canada [2]. It seems suspect to think that truckers and racists would choose such an iconic and expensive venue to display this symbol of hate.
Given that most of us never expected the severe curtailing of civil liberties by a liberal democracy such as Canada, I think it is prudent for us all to be skeptical about the facts on the ground in this incident as it almost appear engineered to sow the seeds of hate against the protesters in this case.
[0] https://en.wikipedia.org/wiki/Agent_provocateur#Canada
[1] https://twitter.com/McloughlinGuy/status/1489468112009408514...
[2] https://twitter.com/GuitarBill609/status/1495447010291372034...