Both the words "our government" (i.e. the current canadian government), and "that" are doing work. Neither examples of random governments committing significant crimes, nor of the Canadian government committing less significantly corrupt crimes, contradict the premise.
There is ample evidence of the Canadian government breaking the law for their own benefit and there is ample evidence for these occurrences being “significant”.
And that’s not even taking into account that once trust is broken there are likely many more instances that aren’t known.
So by "significant" I'm excluding nonsense like this [1] where the government comes up with a creative (incorrect) interpretation of the law, and things like "a few rogue members of the government break the law" (e.g. [2]).
Neither of those would explain a government entity hacking this website to leak this data in an attempt to benefit the government.
I can't produce evidence that there isn't a history of actions like this, since my evidence really is just the lack of evidence. Thus I'd ask you to produce the "ample evidence" you claim exists.
One relevant example of the Canadian gov breaking the law and lying about it until they were caught was the 2007 Security and Prosperity Partnership protests in Montebello Quebec. In that case the government used agent provocateurs (provoking agents) who were dressed as protesters while initiating violence to paint the protesters in a bad light. The linked Wikipedia article lists several other examples. [0]
That said, I don't think the state was the responsible party for this attack.