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Are you implying they are doing some kind of instant background check with the ID? If not, what good is checking ID?

The knowledge that you won't get away with rape, kidnap, or robbery acts as a deterrent.

Deterrence. Having your ID on file (vs knowing only a name that they likely made up) makes a potential criminal much more likely to get caught, so they're much less likely to do anything bad.

Good job there is not such thing as false ID

It's still another barrier that deters people - it's a numbers game, not about impossibility.

And even a forged ID would have a valid photo that looks like you, which is much more helpful in finding a suspect than simply eyewitness/victim testimony.

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