No man ever became extremely wicked all at once.

Serious wrongdoing gets arrived at in stages, each of which looked defensible at the time. Nobody makes a single decision to become the sort of person they end up being. They make a small exception, then a slightly larger one made easier by the first, and the ground shifts under them a step at a time. That is what makes early compromises worth far more attention than they get.

Picture the third or fourth version of the small thing you have started allowing yourself. Stop at the current step rather than at the one where it becomes obvious.