The longer (maximum) sentences are to reflect the magnitude of the damage that can be done. A single instance of 'hacking' can cause millions or billions in damage (depending on the situation). As others have stated, there needs to be a tiered system so that lesser crimes committed 'with a computer' aren't under the same blanket law as criminals that hack into financial institutions in an attempt to steal money.
Sort of how a death can result in a manslaughter charge, or various degrees of murder charge (each having different maximum penalties and distinct qualifications).
Sort of how a death can result in a manslaughter charge, or various degrees of murder charge (each having different maximum penalties and distinct qualifications).