I think Harper would do the exact same thing. As I've mentioned, I'm not the biggest Harper fan, but he did what was needed to help the country. Let me put it this way, he was a supporter of business, but not bailouts. When the financial crisis happened, his government went against its usual policies to make sure we came through.
As for the mandates....most of the ones these people don't like are provincial. Canada could lift the border mandate, but the US still has it. So, WTF would that change? You also seem to think that he is acting this way because they didn't vote for him with no evidence.
As for national security being threatened: When about half of all the donations are coming in from foreign sources to fund illegal activity....that feels like it could be a security threat. Is it overblown? Maybe. But I seem to recall right-wing people getting bent out of shape when foreign funded environmental groups protested the oil sands. Amazing how they now feel this is alright...
And the Windsor protest was not done until after he invoked the act. Then there were border blockades yesterday in Alberta and Manitoba.
I'm not saying the Emergencies Act was the best course of action, but I do understand why it is happening. There comes a time when things go too far. And the Ottawa police do bear a lot of this responsibility for not acting decisively when they first came to town. They allowed them to dig in and this issue has festered ever since. On top of that, where was the premier? Hiding out at his cottage. He could have shown some decisive leadership for a provincial matter, but he didn't. Now, I'm not saying he did nothing because he wanted to hurt Trudeau (which may be true), or that he did nothing because he knows some of that crowd is his base (probably more likely), but the fact is....he did nothing. Heck, Ford is supportive of Trudeau invoking the act, as are a bunch of other premiers.