Bike thieves move fast, and a lot of time they are in cars, it's not always some random guy on the street. I saw a brand new Lexus pull up to a bike at a red light in a fancy neighborhood, guy was actively in the road and parked blocking the lane, and stole the bike in literally 40seconds and was gone. No license plates. I called it in but I doubt they did anything about it. And I'll never risk my life for a bike lol.