Nova Scotia Mass Murders

Whatever was in the mind of the businessman who dressed as an RCMP officer and drove a car that looked like a police car to step out of his lovely home and coldly murder 18+ people in a tiny community in Nova Scotia?

The press has made it a point to not focus on the killer but to focus on the innocent lives lost and I understand this but I still want to know what was in the killer's mind.  I'm assuming he has never killed before and people who knew him seemed to like him so he couldn't have been too overtly mentally ill or someone would have noticed.

I'd like to know what his family or close friends observed that could have been the warning that would save 18+ lives.  I say 18+ because the killer also set 3 houses on fire and there might be dead bodies in the ashes.  These are such horrible crimes and it's impossible for there not to have been something for people close to him to notice.  Those are the things I'd like to know because seemingly normal people do suddenly snap and commit outrageous crimes.

The police said some of his victims were planned but then some were random.  It's as though he had a hatred for certain people but once they were removed he just decided somehow that he may as well kill some more even if he didn't even know them.

This was the largest mass murder in Canada's history.  We're not like the States where mass murders have become almost common place.  Maybe one of the reasons is that fewer Canadians own guns.  This killer did and he used them to commit murder.  

He owned a business and some houses so he was a contributing member of society.  He was 51 or 52 years old so he had a history behind him.  I'm sure his business was closed because of the coronavirus epidemic and that would have been costly for him but it couldn't have caused a man to do what he did.  I have to assume he was mentally ill at the time of the massacre but I wonder how long he hid his mental condition.  No sane person walks out his door one day and decides to commit mass murder.  Something triggered that response in him and he lost control of himself.  I wonder how long he had been a ticking time bomb and if all those lives would have been saved if only someone had seen what was coming.

I believe we need to know the specifics of his mindset because it would help us recognize it in others.  I saw that someone posted on Facebook that he was a monster and maybe he was.  We need to know.