You're missing the point, where benevolent doesn't equal good, but either way, yes, "good" or "evil" is relative.

Robin hood stealing from the rich to give to the poor - that's going to be seen one way or the other from the rich person being stolen from vs the poor person being given to.

To have a moral system where defining something as unassailably good is also prone to manipulation - once you decide something is truly good you're more than willing to go to any end to defend or enact that good, including committing atrocities.

Some actions are harder to see as being subjective, sure, but there's always going to be gradients and perspectives.