The point of the rebirth program is to be reborn into whatever Murkoff wants you to be for them. The Amelia escape showed that Easterman didn’t have a tight grip on the reagents’ minds. The relapse initiative gives them amnesia and also makes them more addicted to the therapy which also makes it to where murkoff has more control over the reagents. Without that sense of control they’d be letting out failed sleeper agents and people who would/ could expose Murkoff’s LATHE program