I feel like life is good. In my life, I found that in general, people have good intentions, though their beliefs and reasons may vary wildly. Though there are some exceptions.
Some exceptions are corrupt politicians adding legal exceptions for big companies.
If we had no presumption of innocence, anyone could go to prison at the whim of politicians.
Or at the whim of anybody. Imagine being falsely accused of rape, then being imprisoned until you prove your innocence (which might not be possible). How would that be justice?