If this sort of continual mismanagement, delay and incompetent planning were happening anywhere else in the aviation process, like engineering, ops, or whatever, the responsible management would have been taken to task and then removed long ago.
Yet somehow security seem able to get out of it with a cry of "well it's for security so you can't touch me".
Yes, security management. Either do your job and manage the security procedures effectively, up to specification, competently, politely, without delays, and without impacting on the rest of the organisation, or stand aside and let someone who can deliver all of these take over. In the general scale of airline operations it's one of the easier tasks.