What were the motive, intent, and types of devices of bombers?

What were the motive, intent, and types of devices of bombers?
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Please search the Internet for these cases:

Oklahoma City bomber: Timothy McVeigh
Unabomber: Theodore Kaczynski
Atlanta Olympic and Abortion Clinic bomber: Eric Rudolph
Mad Bomber: George Metesky
Please choose 2 of them and discuss each bomber, list the motives, intent, and the types of devices used.

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