It stands to reason that on average, if you elect conservative presidents and senators, you will get conservative justices, and vice-versa.
You seem to assert that there are wolves hiding in sheeps’ clothing, waiting until they are confirmed to show their true colors to save the country. I counter that reality is more boring than that, and that these people can be taken at face value by virtue of what they’ve said and done for decades.
Furthermore, I think yours is an apologist/denialist stance people use so they can get someone in the courts they truly approve of, while hiding behind the “hope” that they won’t be as bad as everyone else knows they will.