More information on Wikipedia: https://en.wikipedia.org/wiki/Emergencies_Act
Furthermore, have you read the link you sent? The entire "Provisions" explains while this is way out of line to deal with protesters in Ottawa.
Using it for "Public Order" as Trudeau is doing, was meant to be a tool against:
"The Act references the definition provided in the Canadian Security Intelligence Service Act, which includes espionage, sabotage, detrimental foreign influences, activities which support the threat or use of violence for a political, religious or ideological objective; or those activities which threaten to undermine or otherwise destroy, or overthrow the Government of Canada."
You'll never guess who was actually planting the bombs at that time. [0]
[0] https://en.wikipedia.org/wiki/List_of_controversies_involvin...
From https://en.wikipedia.org/wiki/October_Crisis
> police officials sometimes abused their powers without just cause, and some prominent artists and intellectuals associated with the sovereignty movement were detained.
And to all the comments saying Canadians are supporting this move, they also supported it back in 1970. It's when they saw the consequences and that they actually understood how wrong it was that popular support dropped.