Sure they do. Don't you remember knowing all about Romney's impressive giving? Isn't tithing an announcement of giving 10%? Don't they reveal it to get charitable deductions on their income tax?
Besides which, Trump doesn't just give to charities. There are numerous stories about him reaching out to help individuals in need.
Actually, some clarification.
‘Giving to charity’ <> acts of charity.
I couldn’t care less what appears on a tax form - after all, the Clinton Foundation is a charity.
Attacking a character because he doesn’t parade his charity on a tax form (as the OP seemed to be doing) is just wrong.
TRUMP / CARSON 2016
TRUMP / CARSON 2016