Lied about a freaking blowjob
Hardly a high crime
If he was being questioned in a case about taxes, for example, lying about a blow job wouldn't matter. But he lied about a blow job with a subordinate in a lawsuit alleging sexual harassment with a subordinate; making his lie directly material to the case. Impeaching him for that was reasonable. And Clinton was 100% responsible for everything that transpired in relation to that.