Trust should be the basis for all our moral training.” - Robert Baden-Powell
Moral training comes basically from early years with parents where trust first lies, if broken when young both trust and morals will flounder.
Most relationships are built on trust, once trust is broken, most occasions irreparable.
Have yet to meet anyone who does not lie, not part of human nature, we can continue trying to keep to straight and narrow, no excuse there.
The problem is that these days moral training isn't actually getting done as well or as much as it used to.