Currently in my new office, there are two juniors under me that both have 1 year of experience. In all my career of 4+ years, I have always helped my juniors. In the case of these two juniors, I have always helped them whenever I could. Even when they did mistakes, I never shouted. Just talked calmly and made them understand their mistakes and whenever I had the time, fixed the mistakes myself.
The worst event happened when one of the juniors just wasn't doing what I told him to do. I told him to do a task and then move on to the next one. But he skipped the "boring" task and started doing the "interesting" task first. After I told him not to do it multiple times, he got his friend, the second junior, and in front of everyone, spouted lies after lies to my senior, like how I don't help them at all.
My seniors saw through their lies. But the reason I am writing this question is how fake people can be? They were taking and laughing with me and just when I thought I could trust them, they did this. Whom to trust when these so "good" actors are in this world? Are really all people like this and do I really need to stop being "innocent" and lie and don't help juniors. Because I don't know what I should do.