I heard from the platform at a district convention that JWs shouldn't give to charities or volunteer at soup kitchens/homeless shelters because the people the aid was going to were going to die at Armageddon anyway. It would be a waste of resources that could have gone to the WT. Plus it was supposed to show a lack of faith that God would fix everything. Well, DUH. God hasn't fixed anything so obviously humans have to step up and help each other.
I was told not to give to the United Way because some of the funds MIGHT go to abortion clinics. I don't even know if that story was true or some BS the elder who said it made up to discourage me from giving. When I was growing up my congregation was told we couldn't give items to the Salvation Army or shop at one of their stores because it was 'false religion'. Helping the Red Cross was out because they used a 'pagan' symbol. Never mind that they aren't really a religious group, at least not in the modern age. The red cross just happens to be the universal symbol for hospitals and medical personnel. Giving to the local Shriners children's hospital was out because supposedly the Shriners had some occult connection. Personally, any group that does good for sick kids deserves my support.