I used to say, "What part of 'shall not be infringed' do they NOT understand?"
But now...I am convinced that they don't give a shiite about anything the Constitution has to say. The country of our fathers is most assuredly and truly dead.
Their worldview does NOT value the Constitution for the same reason they place no value in tradition or culture.
They view themselves, and especially their elites, as being better capable of making decisions than anyone in the past ever could. Contracts, vows, and Constitutions hold less weight than an individual making decisions based on current, modern knowledge, which is inherently in larger quantity now than when the contract/vow was made.