Since we don't know any of the details or mitigating circumstances of the local shooting, we can't really compare the two situations.
In the instance of John Lennon's murder, it was deliberate, unprovoked and cold-blooded. IMO, MDC should spend the rest of his life in prison with no chance of parole, as should anyone else who murders another person in such a callous way.
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"A little learning is a dangerous thing." Alexander Pope