Here I am using 'evil' less in the religious sense (for I assume that for many religions, evil is inseparable from an Earthly realm, whether it be utopian or not), than in the sense of something like 'badness of intention/action'.
By 'Utopia', I am referring not to any specific concept of Utopia (socialist/anarchist/capatalist/monarchical) than a more simple, almost abstract/generalised idea of 'the perfect (or near-perfect/ideal) society'.
Non-religious evil might be a purely relative construct; in that it might always be present towards the negative end of any society's behavioural spectrum, regardless of how narrow that spectrum is.
For example, one society's evil might extend to the worst imaginable forms of abuse. These acts would clearly be evil, much as we consider them as such now. However, imagine a near-idyllic society in which such atrocity no longer exists. Imagine that in this society, the most negative act is a scowl; an unfriendly facial expression.
It seems as if, in the context of such a Utopia - and perhaps in the absence of any worse evil being conceivable - such a scowl might come to be deemed as evil, as it represents 'the worst thing', even though to most societies we imagine, a scowl likely falls well short of any typical notion of 'evil'.
And, if this were to be the case, are we doomed to always criminalise and/or 'demonise' one aspect of our community and be 'harmed' by acts we currently consider relatively trifling? Would we always find someone to punish, regardless of how far we behaviourally progress?
By extension, is Utopia even possible under such a dynamic?
Rather than invite speculation, I am curious as to whether anyone familiar with any philosophical discussion of Utopias (such as Thomas Moore's Utopia), or perhaps Kantian or Millsian 'moral utopias' might have any insights here, as it seems very likely this question has been considered before.