Honestly, some people are either simply: stupid, lack good judgment, unable to asses cause and effect, or some combination of these.
My husband works with a woman (he is her superior) who is just a hot mess, in her personal and professional life, and it's just all related to bad decisions she has made in the past and continues to make to this day. Her head is simply not right. The scary thing is, she is a military INTELLIGENCE officer!!! He has no idea how she got promoted to the point she has. She has no ability to think critically or make good judgements. She is a pushover and a people pleaser and has ZERO leadership ability. She did something the other day (out in the civilian world) that she bragged about on Facebook and my husband had to chew her out the next day at work because what she did was 1.Illegal 2. Extremely dangerous 3. Extremely stupid 4. Unbecoming of a Marine Corps Officer. She really, truly, failed to see how what she did was wrong. My husband had to spell it out for her. She finally relented and was like "you're right, sir, I shouldn't have done that." But, darn it if she didn't go in swinging at first and try to defend her actions.
Just makes me shake my head and wonder how people can be so blind to their own actions and fail to see the big picture.