Why do we need any kind of ID system?

If it's for the benefits system then how about requiring some kind of ID for those on job-seekers, unemployed benefit? Oh - wait a minute we don't need one as don't those benefits go in to bank accounts now? And aren't those banks required to confirm the identities of those opening accounts - something I assume they are doing fine?

I need a passport to go abroad so no issue there.

If I'm a criminal (or was ever arrested!) then they have my fingerprints and DNA. Many forces have handheld finger print readers so that's that taken care of?

So I guess it's the foreigners that are the issue? Is that it?