“Atheism teaches that sin does not exist, and thus murder is not sinful.”
Well, sins are crimes against god, there are no gods to crime against, so no crime is sinful, no.
Doesn’t mean there are no crimes. however.
“Evolution teaches survival of the fittest.”
Yes, but you’re going to take that out of context, aren’t you?
“Combine the two, and it's easy to see why an atheistic evolutionists, like the Finnish murderer, would not be bothered by massacring innocent children.”
Actually, that’s against atheist evolution.
As a species, our ‘fitness’ involves protecting the weak and encouraging survival. We evolved as gregarious animals and murder is against our fitness.
But you want to fuck up the context and blame evolution.
“The logic of the principles *does* tend to permit that conclusion,”
No, just your connotations of the principles. Which are wrong.
“just as surely as smoking a pack of cigarettes a day does tend to result in lung cancer for some people.”
You’re off your nut. Evolution does not teach murder of children. Quite the opposite.