1. Ottawa police have basically put zero effort into doing anything about the nighttime noise or generally criminal behaviour of the "protestors."
2. The federal government should not be stepping in immediately to solve policing issues like this precisely until the situation becomes untenable. THAT would have been draconian and authoritarian.
3. Beyond the city police, the provinces themselves needed to precipitate asking for this in some way, or to appear completely nonresponsive. This is why you saw states of emergency in the City, then in the Province, and only then was the act engaged.
4. The law that was invoked was an (IMO) very well designed piece of legislation that was designed to replace something called the War Measures Act, which was abused by Trudeau senior to end a terrorism threat in Quebec. That overstep of federal authority essentially ensured that law would never remain on the books and it was later replaced with this act. This is why today, tomorrow, and through Monday, there are debates going on on the house floor around the invocation of the Emergencies Act, and if the whole of parliament doesn't agree they can simply end it Monday at the conclusion of the debate when they vote on it. These rules are all clearly spelled out in the legislation. There's also effectively a review process where if this is engaged they must review and continue to agree to keep it in force over time, meaning it could not be an indefinite thing unless the majority of MPs agreed to keep it in force.