I'm not sure that the whole idea of stigmatizing neighbourhoods as "dangerous" is worth much in Toronto. Compared to many cities in the US, the differences between neighbourhoods are more muted. Sadly, I think people like the idea of "bad neighbourhoods" though because it makes them feel safe if they do not live there. Crime happens to "others" who live in "dangerous areas" and therefore it will not affect you in your nice safe haven.
In Toronto your risk of being a victim of crime depends on many factors before geography. If you are not in a gang, if you are not a drug dealer or drug addict, if you do not carry around a weapon, if you are not a criminal, if do not associate regularly with criminals, if you do not wander the streets in the middle of the night while intoxicated -- and so on -- you will seriously minimize your risk of winding up stabbed or shot. If you engage in these activities -- regardless of what part of the city you are in -- you are more likely to meet violence.
Yes, there are exceptions (Jane Creba) but these exceptions are memorable because they are so rare. Rather than focus on geographical areas, we should focus on wider causes for crime. The very fact that the areas of Toronto where you are most likely to be harassed are near centres that supposedly treat mental illness and drug addiction shows that our current solutions aren't quite working. Labeling neighbourhoods stigmatizes everyone who lives and works there. Even in Toronto's "worst" areas I'm sure that 98% of the residents are hardworking and law-abiding citizens.