The purpose of a road is to…

The purpose of a road is to allow for transport, both of people and of goods. Roads pre-date cars by a long shot ("All roads lead to Rome"), so while the prevailing view is that "Roads are for cars," this is a relatively new phenomenon that gives a specific method of transport the ownership of basically the entire roadway.

There are many downsides to cars:
-Environmental impact, both due to their carbon emissions, as well as the damage caused to roadways (therefore they need repair and maintenance more often)
-Danger due to crashes, both to drivers and to people outside of vehicles (in 2022, there were almost two thousand deaths via car crash, and almost 120 thousand injuries in the same year)
-Space inefficiency, both in terms of how much public space must be dedicated to cars, as well as how few people are generally in a given car. Some of even the most bike friendly areas of Montreal need less than 5% of the width of the road, compared to ~65% for cars (driving lanes and parking).

There are many upsides to biking:
-Health benefits from more frequent exercise
-Environmental benefits from reduced carbon emissions
-Neutral or positive impact on local businesses
-More affordable, given the price of gas, maintenance, parking/storage, and insurance for vehicles
-Much better for the public book-keeping, in terms of how much it costs to maintain bike infrastructure compared to car infrastructure.

We are facing a climate crisis and a housing crisis. To tackle those things, we need to reduce emissions and build more housing. Getting rid of space efficient transport and environmentally-friendly options to force people to drive, which requires wide roadways that take up space and force sprawl between plots where housing can be built.

Biking is a much better way for people to get around, as shown by numerous studies looking at a variety of factors. Not everyone is capable/can afford driving, and creating spaces for other options so that Ontarians can choose what method they want to use is the best way to go forward and be as fair as possible.

Don't make it harder to build bike lanes. If you remove bike lanes, the bikes won't go away, they'll just force cars to go more slowly by riding in the car lanes. No one wins in that scenario, as bikes are then in more danger of being hurt by drivers, and cars are stuck behind the slower bikes.