There was one stowaway passenger who is merely guilty of obtaining a flight without paying for it. She was not a terrorist and did not pose any danger to the other passengers, crew, citizens, or the Homeland . So sure, let's implement an enormous "solution" to make sure it never happens again.

You are proposing a system of swipe machines everywhere (entry to checkpoint, boarding gate, exit from airside) which will need to be able to read every conceivable type of ID (including foreign passports, Costco cards and temporary drivers licences) and every form of BP (home-printed on regular paper, airline supplied cardstock, mobile BP on phone). These machines will have a certain failure rate, so each machine will need a full-time TSA screener to over-ride failures or double-check that the machine is functioning properly.

This is not only extraordinarily expensive, but the additional time of each passenger swiping both an ID and a BP, and then getting help from the TSA attendant if it fails, will likely double the time it takes for boarding an aircraft.

Expensive, time-consuming, impractical and ineffective. It's a terrible idea. TSA will love it.

I also fail to see how any of this "avoids anyone trying to commit an illegal act". If it is known before landing that the passenger in 3A stole someone's jacket, the flight crew could either ask Mr 3A to give it back or could have police meet the plane and apprehend Mr 3A when he disembarks, or provide the police with Mr 3A's name and contact information (from the booking). The far more likely scenario is that Mr 1A's laptop is stolen while on board but no one knows who it is.

ID is not security, and more complicated scanning of everyone everywhere is not the answer.