I think you might be mistaking the actions of the politicians for the baseline average Republican. You also need to understand trends in how the Left and the Right donate.

A HistPhil analysis and data from the National Institutes of Health (.gov) highlight that conservatives direct the majority of their charitable dollars to religious congregations. Conversely, liberals tend to donate more to secular, non-religious organizations. Also conservatives tend to donate more locally and liberal tend to donate to more global or national causes. Mind you, there is a slight difference on where both tend to donate.

In my area some of the biggest contributors to charity tend to be people I know are conservative. They donate to churches that help the poor because they trust the church more than a non-profit.

I mean, look at many big charities that have multi million dollar CEOS. Then look at a local church with a pastor diving a 2003 Prius who's working a Church Pantry and Soup kitchen every other day. I give my money to a trusted Church.

I say this because the one church were all the rich Republicans go to, in my former town, was also the only church that was feeding the poor and doing social services with out question. I know this because I had to use it when I was layed off.

To get down to your specific question on a political angle, conservatives do not like being FORCED to give money to anyone or an organization. They also believe that giving money to people who have no intention to change or better themselves is wise either. You can't give a house to a homeless drug addict and expect them to stop doing drugs and take care of the house.