Interesting. So are you arguing that people allowed into secure areas of the airport, like baggage handlers, should not be required to have IDs? Anyone can go onto the tarmac and load stuff onto a plane?
Requiring IDs is one part of the equation, making sure the IDs are hard to forge is the other part. Maybe the second part needs improvement, but that doesn't mean you throw out the first part.
Forgery is not an issue when there are sleepers who can easily obtain IDs. I realize they perform background checks on airport employees, but that doesn't mean they should do the same for all passengers, the costs would far outweigh any benefit.