plawrence
He had already given Fredo the "kiss of death." His attempt to lure him into the car was simply so he didn't lose track of him, because he had already decided to eliminate him.
Agreed. Michael was following his own adage: keep your friends close but your enemies closer. He didn't want Fredo to disappear into the night, possibly to go to Roth and divulge even more Corleone family secrets, possibly even to set up a hit on Michael again. He wanted Fredo in his sights, so that he could kill him when Mama died.
