Taking Advantage of the Welfare State

Many people living in the generous modern Welfare State do everything they can to take advantage of the system; they try to reduce their tax bill and claim as many subsidies and benefits as possible.[1] The question is whether they should be blamed for doing so? In other words, is such behaviour morally acceptable?

In fact, such behaviour is generally considered immoral, which is somewhat paradoxical since it is so pervasive.