Here are ten you may want to think about. Each organism moves to its own perceived satisfaction. This principle from biology applies to the human species as well. Self destructive behaviors often occur because the individual perceives a potential gain, e.g., attention, pity, care. Honesty is conditional.
Truth is relative.
My truth is not necessarily your truth. Both may be true at different times and in varying situations for each of us. But to assume that we hold identical concepts of what truth is, is to be naive as to the vast differences in human character and situation. With many people, what you see is NOT what's really going on. To borrow from descriptions used in the Myers-Briggs Type Indicator, people who are both highly introverted and intuitive tend to not show others what is really going on inside.