How did the McClellan help the confederates?

McClellan on multiple occassions allowed the Confederate army to escape even when he had the resources and manpower to crush the opposition. He also directly disobey orders from Lincoln, and was known to take his time when it came to fighting. His blunders allowed the confederates to regroup and even defeat the US forces.

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the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.