What you assume WRONGLY is that the conservative wants to spend his money only on HIMSELF.
Fair enough - there's charitable contributions too. (To the conservative's church (provided of course it's the right sort of church, without too many poor people); or to the conservative's (often Ivy League or religious) university; or to organisations the conservative supports ideologically (eg foundations which seek to "cure" being gay)).
The government, on the other hand, wastes tax money by spending it on healthcare, infrastructure, welfare, defence, universal education and useless things like that. Do you know, they hardly spend a penny on churches, or the other things conservatives tend to like to give to by way of charity ? Governments are bloody useless, aren't they ?
Could there be any greater conceit, than for someone to believe that the universe has to be simple enough for them to be able to understand it ?