There are thousands of ways to express encouragement and enthusiasm and support. Few of them require a blood oath or even much inconvenience.
“I’m thrilled that you’re contributing.”
“Can’t wait to see how this turns out.”
“I know someone who really needs to hear about this.”
“Go make a ruckus, it matters.”
If we want things to get better, it helps to encourage people who are eager to make things better.
