The President nominates a Supreme Court justice but the Senate APPROVES that justice. In effect - you have to have approval from both parts of that equation. If the Senate doesn't want to approve a candidate or even hold a vote they're doing precisely their job. The approval of the Senate of a nominee isn't just some rubber stamp formality.
That's literally the whole point of "checks and balances". You might as well proclaim that every one of Obama's vetoes was impeding the duly elected legislature. At least you'd be consistent.