I think you are justifying killing. Once you justify it there are always plenty of more people to kill.
George Monboit "Neoliberalism is inherently incompatible with democracy, as people will always rebel against the austerity and fiscal tyranny it prescribes. Something has to give, and it must be the people. This is the true road to serfdom: disinventing democracy on behalf of the elite."
It might be necessary. It might be done for a good reason.
But it's never a good thing.
If someone had whacked Idi Amin, or Robert Mugabe I would have cheered that since it would have short circuited years of oppression