Airlines need to move pilots without planes from place to place and can't always get them a regular cabin seat so it's clear sometimes they'll need to be in one

Airlines need to move pilots without planes from place to place and can't always get them a regular cabin seat so it's clear sometimes they'll need to be in one of the jump seats. Most of those in the main cabin are already dedicated to flight attendants so it's just down to the cockpit jump seat. As pilots they're already in the ultimate position if they wanted to do anything malicious with a plane so it's not really an additional security problem to have them up there.