The first part of my post below is basically a long winded version of
@brihard just said. However, I have second reason at the end.
Two reasons.
First, it's unconstitutional; the proposed law goes completely against the structure of our system of government. We have a division of powers. Within that division of powers, one provincial government can create a law that a subsequent provincial government can simply cancel by passing a new law. Similarly, the federal government can create a law that a subsequent federal government can simply cancel by passing a new law. What
cannot happen within the framework of our constitution is for a provincial government to cancel a federal law by passing a provincial law, and vice versa, which is essentially what this law aims to do. EVEN IF it is blatantly clear that a federal law violates the constitution, the provincial level simply does not have the authority to pass a law to ignore that federal law. Whether or not a law passed by one level of government passes infringes on the assigned powers of the other level government is the responsibility of the judiciary, not he legislature, to determine. And it HAS to be this way; the application of the constitution is complicated, and the division of powers have a significant amount of overlap, and you need experienced, intelligent and knowledgeable judges to sift through it all.
Just have a read of section 3, "
The Distribution of Powers in Selected Areas" to see many of the different ways that the courts have established/clarified the division of powers. Just as one example where the courts have provided clarity, Nuclear Power. Normally, provinces have jurisdiction over natural resources under their powers regarding taxation, local works and undertakings, and property and civil rights in the province. However, the Federal government can claim jurisdiction over some of these under section 92(10)(c) if such works are for the general advantage of Canada or for the advantage of two or more of the Provinces. Given the sensitive and strategic nature of Nuclear power and substances, the Feds hold jurisdiction on these matters.
Second, because the way it's written and the things that people are saying in support of it lead many people to believe that Albertans don't intend to use this law to push back against
legitimate federal government overreach, but that Albertans will use this law against
any federal law that they don't like. What's become very apparent through my reading lots of discussion regarding the Sov Act (not just here, lots of other places), is that most people don't actually understand the constitution and the division of powers, and like to blame the feds for
everything (especially if the LPC is in power). So, whenever the feds pass a law that Albertans don't like, even if it is very obviously within their power to do so, Alberta could use this act to simply ignore it without (or prior to) any appropriate judicial review.