Of course I recognize the amendments. As adeptblue stated, the process for amending the constitution is itself constitutional and, in fact, one of the constitutions greatest strengths.
Personally, I think you misinterpret what all these conservative "whack jobs" are saying. Arguing for the primacy of the constitution in U.S. law and government does not in any way require me to consider it a perfect document. Only that it is the standing law of the land and MUST be obeyed unless and until an amendment is made to it. Otherwise, we have no law and order of any kind in this country.
So when someone looks at me and says, "The government should take over providing healthcare." I'm going to say, "The constitution doesn't allow it." But by saying that, I'm not making a judgment on whether it would be better or worse to have the government provide healthcare, or whether there should or should not be an amendment that allows the government to provide healthcare. Only that the constitution, as it is currently written, does not allow it and, if you want to move ahead with a government run healthcare system, you must first change the constitution to allow it, then move forward with implementing it.
It's about order of operations. Most liberals want the government to do what they feel is best and then, after it's done, change the law to fit what they did. That results in a government that moves quickly, but without boundaries or respect for the authority of the people. Meanwhile, most conservatives want the government to change the law to fit around the issue at hand and then act within the powers granted by that law. That results in a government that moves slowly, but with clear boundaries and great respect for the authority of the people.