I looked into this further and this is the summary:
Wortman got divorced, his ex-gf finds a boyfriend, Wortman gets divorce fucked financially, 2 months ago had altercation with police, wanted to be an RCMP cop when he was younger and was his dream job which is why he collects police items. Corona hits, his business is not declared essential and gets financially screwed further, basically went fuck it and enacts his revenge against his ex-wife and the RCMP.
But here's something interesting about the issue of gun control regarding this.
Trudeau mentions further measures to tighten gun control in response to this but how he acquired the firearm is not being brought to enough light.
After killing his ex-wife, someone reports his cruiser & the crime that took place during the arson, hours later a female RCMP finds the fake cruiser and rams him, they both get out of the car and then the female RCMP is overpowered by wortman, is then killed and has guns taken by wortman. Continues on killing spree.
So there you have it, because a female RCMP who wasn't trained enough in physical combat got over-powered, loses her guns to a killer, and now citizens will have an even tighter gun control policy, as if it wasn't tight enough in Canada ffs.