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Can't we just push them into a moving propeller or running jet engine...
We could always load them up in a bomb bay for a high altitude drop over shark infested waters. That might even please the PETA people by feeding them.
I wasn't taking aim at anyone here - more at the crusading spirit of tabloid newspapers and populist politicos who think naming and shaming these creatures, knowing the likely outcome, is a good idea. I would say lock em up for life - for everyone's safety.