I have a master's in politics, and here is some of the thinking around deficit spending.
Government spending does a ton of things. It funds social services of all kinds, infrastructure, and encourages economic activity. Yes, debt is absolutely a drag on the economy, but not as much as you'd think. In general economists and policy wonks aren't worried, unless drumming up worry about debt is to their benefit.
If Canada went hard on the debt, enacted austerity measures across the board, the resulting economic downturn and political chaos would be more harmful to the national economy than the reduced debt would justify. If you and your family stopped eating and turned the heat off in winter to pay off the mortgage, you would die. The reduced debt wouldn't be worth it. Recovering from that event would be outrageously expensive, both in the short and long term, and it would be political suicide for the current regime. When governments talk about austerity they mean cutting programs to the poorest people, who don't have the economic power to do much of anything anyways.
A lot of the spending is technically debt, but not really. When a government commits to funding project X with 10 million over 10 years, they are paying 1 million and incurring 9 million in debt on the books. There is no interest being paid on the 9mil. In a decade that million that is being paid to the project isn't worth what it was when the project started, so the commitment gets cheaper over time, at the rate of inflation.
When people seeking election or criticizing the government start making noise about the deficit, look at what they are trying to draw attention away from. It isn't the crisis situation it seems to be.
Canadian consumer debt, however...
Edit to add:
The government also subsidizes industries. Resource extraction, tourism, agriculture, the film industry... Almost everything has some sort of direct or indirect subsidy. There is no ROI for the government on this spending, but if it stopped the net good done to the national economy as a whole would dry up. It's worth the debt, if you look at the big picture. So deficit spending is a fixture and Canada has a strong and diverse economy, considering our population size.