Corrected entry: When Kevin opens the window, he overhears Marv and Harry planning to return that night at nine o'clock. At this point, Kevin could have simply called the police and told them what was going to happen. The Wet Bandits would have been caught immediately.
lionhead
2nd Nov 2017
Correction: 2 things, 1 he was worried the police wouldn't believe him and 2 he enjoyed being home alone at that point and didn't want cops to take him somewhere else.
lionhead
He may have also been worried since he accidentally shoplifted.