Okay, so what's the deal with one-way streets?

I'm driving around downtown Regina on Friday. Not the busy, commercial streets like Albert, Broad or Victoria. I'm on the little, dinky side streets. They are so inconsequential that I can't even recall their designations. I think they were numbered, like 12th Ave.

And these little, unimportant streets are one-way. WHY!?! What possible purpose could you hope to achieve by making backwater, unimportant downtown streets one way? There's no traffic! I'm driving around and sure, there are some signs, but you could put it on the honor system for all the traffic that there was. Leave them the easy way, two-way, and stop confusing people. One-way streets just get on everyone's nerves.