What's happened to the Masamune to make it so evil? in Chrono Cross the Masamune is shown as an evil sword that draws out the wielder's dark desires and generally causes them to kill their allies.

yet in Chrono Trigger this never happened to Glenn or Cyrus and if what was happening with it in Chrono Cross was because of how the Masamune was created from the Red Dagger being used on the Mammon Machine (and thus influenced in some way by Larvos) then the 2 of them should have been feeling the effects already since they wielded the sword before the events of Chrono Cross

So what's happened to the Masamune to make it so evil?
Maybe the cause was the fall of Guardia kingdom and theft  of aformentioned sword. 
https://www.chronocompendium.com/Term/Fall_of_Guardia.html