Charity means to help, to support someone who needs it. We all have weaknesses, failings.
There are 2 types of people in the world - 1. Those who keep judging our weaknesses and exposing them & 2. Those who protect us by hiding our failings.
Just imagine how terrible we would feel if everyone only pointed our weaknesses. We would feel exposed, naked. We would feel isolated.
When you hide people's weaknesses and don't expose them to others, you are doing a most noble charity. Protect people from their weaknesses as a mother would protect her young baby. Do charity.