I have known a vast quantity of nonsense talked about bad men not looking you in the face. Don't trust that conventional idea. Dishonesty will stare honesty out of countenance any day in the week, if there is anything to be got by it.
Every kind of peaceful cooperation among men is primarily based on mutual trust and only secondarily on institutions such as courts of justice and police.
When young we have a vivid sense of basic values like trust and warm-heartedness, which we tend to neglect in today's competitive world as we grow up, yet from birth we all have a need for affection. The emotions we experience today have not changed much over the last few thousand years, but the interest increasing numbers of people are showing in their inner world and how their emotions work is a sign of maturity.