Show me where it's mandated that Congress give every nominee a hearing. Your observation is factually incorrect. I don't think you'e lying, I just think you're a victim of a common misconception that one political party has a present interest in encouraging. From a civics perspective, I think this is very irresponsible of them. They are fomenting discontent based on false information.  
The power delegated to the Senate includes deciding how many justices sit on the Court. It used to be set at six and once as high as ten. It's entirely their prerogative. Nowhere is the Senate required to conduct a hearing. 
Article II, section 2 says the President "will nominate and by and with...the consent of the Senate, appoint...." There is no obligation on the Senate for how or whether they give their consent.
Schumer took much the same approach in 2007 at the end of W's term. He was on safe ground then, the same as the Senate was in 2016.