Here are some comments said when subject comes up:
"We do one step better than any charity because we do not just give out the fish, we instead teach people to fish."
"Families are responsible to care for their sick/needy."
"The mandate from JC is the preaching and making disciples work. It is what true Christians should be busy doing. The poor/sick/needy will always be with us until the Kingdom comes."
"If people accepted our message and put into practice biblical mandates, they would improve their life. They do not, so, let them suffer the consequence of their actions."
I do know of a few that contribute to cancer charities, though. But, as a group, donations to charities very much discouraged.