What is so conservative about today's "conservatives"?

It is very ironic how people are using the word "conservative" today. May I remind people that the root of the word is "conserve" which means avoid change. Clical/institutional conservatives are against rapid change in governmental and societal institutions. There are many positions that "conservatives" stand for today that disagree with the clical definition, such as rewriting the tax system, privatizing social security, removing corporate regulations, starting wars that can be avoided through diplomacy, privatizing the post office (which is also in violation of the constitution), removing consumer and labor protections, removing government safety nets, giving corporations unlimited rights to destroying the environment, and so on. Such policies are more defined by clical liberalism than clical conservatism. Keep in mind that many "conservatives" today align themselves with libertarian economic policies, and it is not just a coincidence that the word "libertarian" is so similar to the word "liberal". So how can "conservatives" today claim in good faith that they are actually conservative? What do they stand for that agrees with the clical definition of conservatism?