Apart from our responsibilies to our families there are ethical issues about charitable giving and tax.
My sister in law disapproves of tax relief on money given to charity. She considers that
tax is needed to provide the public services determined by a democratically elected government (even thought she may not approve of all that the government decides to spend it on) but that our individual choice of "good causes" is not democratic and should not benefit from tax concessions.
By the way, it is not hypocritical to benefit from something you campaign against (provided you don't claim not to, or attack others for doing so). I would like income tax rates at higher incomes to be raised but I don't volunteer to pay extra tax.
Jane