What happened to Tyler -- the poor judgement under crisis -- is common among people who are grieving intensely. That Tyler, at his young age, was having to deal with the sudden decline of the person who literally personified strength to him (and to millions of strangers) at the very same time he was put in the pressure cooker of being the youngest D1 coach in the country, was too much to bear. Most people would be shocked to know how many extra-marital affairs happen when one partner is overcome with grief of some kind, or the pressure of being a new father, or new job, etc. Can any of us truly understand what it must have been like for the only child of one of the most respected human beings on the planet is suddenly preparing for that person to die a horrific death at a young age? I can't. But I can understand the impulse to do something totally out of character and dangerous as a way to gain some measure of control in a situation that seems totally out-of-control.
A very young man made an all-too-common mistake at a time in his life when he was most vulnerable and overwhelmed and preparing for his Rock, his Compass, his dear mother, to die. If there are people alive who still can't find it in their hearts to forgive him, then they need serious help.