Is tax avoidance a form of betrayal?

A person who deliberately manoeuvres his finances to avoid paying otherwise due taxes is effectively saying that the costs of running the country should be borne by the less well off, the less privileged in the community; dare I say it, the plebs. Although avoiding paying taxes is not illegal, is there not a whiff of betraying one's community by taking steps to not fully contribute to the costs of state. It may be legal but is it amoral? Politicians take note; it is not necessarily a private matter, there may be consequences. It suggests, for instance, that we are not all in it together.