It is important to act after failure because it shows determination for your goals. Take failures and treat them as another reason to get back on your feet.
It's important to act off of failure or injustice because if you don't then you will continue to live with the failure and never accomplish what you wanted to achieve.
Obstruction of justice in attempting to impede the investigation of the Watergate break-in, protect those responsible, and conceal the existence of other illegal activities