The reason has to do with matters of the human heart. If we are required to do anything by law, and thereby forced by public authority to undertake some action, we comply because we must. That we go along with the demand is no great credit to our sense of humanitarianism or charity. The impulse here is essentially one of fear: we know that if we fail to give, we will find ourselves on the wrong side of the state.
Remember that the government has no money, no resources, of its own. Everything it has it must take from the private sector, which is the engine of wealth creation. If we can imagine a world in which there is no private sector at all, we can know with certainty that it would be a world of bare subsistence at best: universal impoverishment.
Wealthy societies today can afford to create large welfare states while avoiding that fate. But let us never forget the funds that make it possible do not appear as if by magic. They are taken from others without their active consent except in the most abstract sense that people might vote for them.
I cannot see how this method of redistributing wealth has anything to do with the Gospel. Jesus never called on public authority to enact welfare programs. He never demanded that his followers form a political movement to tax and spend. Nor did he say that the property of the rich must always be forcibly expropriated. He called for a change in the human heart, not a change in legislation. There is a massive difference.
There are other grave dangers in confusing the welfare state with personal charitable obligation. The more people hear that the welfare state discharges their moral mandate to give, the more these programs crowd genuine charity. "I gave at the office," becomes the attitude. This is essentially what was behind the comment by Ebenezer Scrooge in A Christmas Carol when he dismissed his need to be charitable. "Are there no poorhouses?"
There are further problems. The programs are not effective over the long term. They generate dependency and bureaucracy. They create upside-down incentives. But leaving all that aside, the core message here is that, from a moral point of view, they do not fulfill the criterion that the Gospels specify for generosity, which must come from within and cannot be imposed from the top down.
Rev. Robert A. Sirico is president of the Acton Institute for the Study of Religion and Liberty in Grand Rapids, Michigan.