Why would you donate the money to a joint disease charity, not a different one?

Question: Why would you donate the money to a joint disease charity, not a different one?
- Keywords:
  charity,
  disease,
  donate,
  joint,
  money
Asked by Alfredo Sauce to Ian on 8 Jun 2018.
- Ian answered on 8 Jun 2018:
  
  I work on curing joint diseases, but that’s not the main reason I want to support CCAA. When most people think ‘joint disease’ they think of either athletes who have suffered a nasty injury, or elderly people. I want to make more people aware that really young people can also get terrible joint diseases, and that without our help they may have to spend their entire lives dealing with the pain.

Question: Why would you donate the money to a joint disease charity, not a different one?