It's funny, because when I try think of a single human who has lived without judgement, I think of Jesus Christ, arguably a very unique and memorable human (whether he really WAS like that is debatable, but we can at least say that as a character he is unique and memorable).
Judgements are a biological instinct for self-preservation. If you want to be a buddhist or say life is vanity, and that you should enjoy the day without fear of death, then all power to you, I say that earnestly. Most people, however, lack the capacity to shake this fear, so they judge people. I'm more inclined to walk by a woman at night, or avoid men, because men are statistically more violent. I'm more trusting of someone presented well in a suit than a someone in a hoodie/baggy clothes with a possible drug addiction. It doesn't mean you should scorn people for looking "dangerous", but you should definitely use your judgement to save yourself if you're someone who wants not to die. Still, I don't believe you should judge that person
, just the situation in itself.
Judging people is a remnant of our tribal roots when humans very heavily depended on direct social interaction to coexist. We removed murderers, thieves, and outsiders because we lacked sufficient social skills and paradigms to exist among a large group of people. I don't believe that judgement of people is the right thing to do. You can judge situations, ideas, problems, and solutions, but the individual should be understood, not judged. Try and live with the mindset that you would be that person had you been born under the same conditions as them, that a small deviation in your life at a young age could have set you on the same path. You begin to understand why they are behaving in such a way, and your resentment for humanity begins to fizzle, you're first moved to pity, which moves you to do good. Little by little, the world may hopefully be salvaged in this fashion.