Do you feel like you would be less inclined to share with people you have nothing in common with or less in common with than those you believe you have a lot in common with?
I've read that one of the biggest factors militating against welfare states has been up shots in diversity or distinction or distinguishing traits among those subscribing to or using services.
That is to say that some social commentators suggest that when taxpayers were paying for services which they were unlikely to use themselves but which are universally available they were less worried about it when they could safely believe that while they were not using them people much like them were.
In the most vulgar sense this could involve racial or sectarian divisions, so an ethnic or religious majority will not wish to pay taxes for universal services which they believe are used by minorities to which they cant or dont relate. In a more sophisticated sense it could involve real or perceived cultural differences, so particular social classes or status groups will not wish to pay taxes to fund services which they believe are being used by others who do not share key norms or values with respect of employment, work ethics, learning, health consciousness or civility and neighbourliness.