No extra effort is required to demonize someone that invades lands and kills the people there. It was demonic when the US did it, and Russia doing it now is also demonic.
Remembering that people are responsible for choosing their own behavior, if they are currently engaged in demonic behavior, it is fair and just to currently call them demons that need to be fought by those that genuinely believe in freedom.
If they do not want suspicion and demonization leveled at them, then they could withdraw from lands that do not wish to be ruled by them. Putin choosing this would undermine his decades of rulership, however, so lies and bloodshed remain his best, most self-serving defense. It is unfortunate that he is able to convince so many to believe his blatant excuses, and callously spread his war propaganda.