The entire point of the expression is that many people will do things they shouldn't do if they are given an easy opportunity. The idea is that shame is ultimately what keeps most people in line. The vast majority of people won't commit armed robbery, but a few more will pickpocket, and more still will take the cash out of a wallet they've found before turning it in.

The point of creating friction is that it's the friction that keeps most people in line. A bike lock isn't going to protect your bike from being stolen by someone who is okay with being a bike thief, but if you leave your bike out without a lock, you've just opened yourself up to having it stolen by a much, much larger portion of the population who don't see themselves as "thieves" as they commit theft.

You can just look at what's happened on SF transit. SF has (intentionally) created a system where you technically don't have to scan your card to get on the bus if you have a monthly pass or use the iphone version of payment... the result is a shitload of people who would otherwise pay for the bus if you had to scan your card, and everyone knew you were cheating the system if you don't, they just don't pay now. If you make it easy for people to be bad actors, more people will be bad actors.