When you see others are doing good deeds?
How do you react?
Giving your moral support? Giving physical support? Giving motivation and encouragement? Join them? Share with others and encourage others to join? Being inspired?
Most important, even no reaction is better than you stop others to do good deeds.
e.g. Even though, you hate stray animals like dogs or cats, and when you see volunteers are feeding them, trying to trap them for neutering. Are you going to stop them? Are you going to scold them? Are you accusing them for causing over population of stray animals?
If you can’t offer help, please do not harm and keep silent. Don’t give pressure and stop others from offer helping hand.