ARMED security at the airport should be government Law Enforcement Officers.
The unarmed security is fine.  They are the eyes and ears of Law Enforcement.
As for all the pudgy guards, some I've seen walking in from the parking lot having to use a cart to haul their stuff or just to lean on, need some very serious assessing as to their capabilities to perform the job.  Any LEO must perform to some minimum standard of physical ability to order to hold the job.  This needs to be done soon.