“It's not your fault."

As Eckhart said, "Nobody's fault. Every human acts according to their level of consciousness."

Regarding human doing, nobody is perfect, and nobody knows everything. You did the best with what you knew at the time, which was enough, you are doing the best with what you know at this time, which is enough, and when you know better, you will do better, which will be enough. Then with open/growth minded, you can work on making your best better.