The link to the article you posted mentioned that the man was walking through the park at 9:00 p.m. And he was 79 years old. And apparently alone. Definitely tragic, but possibly avoidable.

I can only speak for myself, but you wouldn't catch me walking or biking through any city park at night, or alone for that matter. Maybe you have a friend that can go biking with you? And hopefully there's a different way to reach your mountain bike trails to avoid the potentially crappy areas of the park.

Not sure what the weapon restrictions are up there in Canada, but before you start packing heat, I'd check up on the laws and training needed...