[vacri]

If there is a non-zero chance of causing an accident and harming someone by breaking traffic laws, and the only benefit is saving time or not annoying residents, how do you justify that?

I justify that because I am not an absolutist. If you're really going for the 'what price a life' argument, unless you're giving your entire income and free time (excluding enough to keep yourself alive) to a relevant charity (say, clearing minefields), you also don't believe in 'any-percentage-over-zero-is-too-high'.