To give a succint example that is easily understood by the many, not even in the case of a person who is perfectly possessed by evil spirits does the Church consider that individual 100% “evil,” despite the actions he or she may have carried out while under the influence of personified evil. Let alone in the case of people who are not possessed in such a manner, or even harassed by evil or obsessed.
Hence for some Christians and Catholics to consider and describe their fellow human persons in terms of the language referenced above is to manifest inadequate catechesis in the teachings of the universal Church, including Patristics, at best. And to manifest unexpunged self-righteousness – spiritual pride – at worst. The use of such language, therefore, in relation to fellow man does not bring people closer to God. It just calls down His judgment upon oneself, since the judgment of human persons is arrogated to God alone.