Earlier quoted context omitted.
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lions aren't consciously deciding against a rationally plausible alternative, they are eating what is available.
similarly human cannibalization stories generally center around the concept that the people driven to such actions are given no sensible alternatives (airplane crash in a snow mountain comes to mind) -- so we don't presume they were evil, we presume they were desperate.
lions lack the intelligence and forethought to see the consequences of long term decisions. We as humans have gauged and measured the effects of ranching on our environment, the effects of meat consumption on our physiology, etc.
so, to answer your question : If the lion was able to empathize and relate to the suffering of the prey, if the lion was able to relate its' actions to the destruction of its' environment, if the lion had sensible alternatives that avoided long term consequences while still satiating hunger, if the lion could accurately forecast the future and STILL decide upon the destructive course of action...
...yes, an argument could be made that that lion might be evil.