Clinton wasn't being impeached over a war, he was impeached for getting a blowjob in the Oval Office and lying about it afterwards. Note that during that impeachment thing he fired a bunch of cruise missiles into Sudan and Afghanistan. Obviously just trying to distract from the whole scandal, right? Except that strike was against a little known group called al Qaeda that led by some guy called Osama bin Laden. Had those strikes succeeded in taking out bin Laden it would have been considered completely about a distraction from a scandal.
At any rate, Clinton fired missiles at a bunch of different countries during his presidency. What exactly would have been the lesson had he been impeached for lying about a blowjob? The lesson would be kill whoever you want as long as you don't have an extramarital affair, or at least don't get caught! There are no lessons there about firing missiles at countries and the fact that one of those attacks could have prevented one of the biggest terrorist attacks in history, the lesson actually goes the opposite way. Maybe Kissinger was right, the attacks didn't go far enough.
Sure Clinton probably should have faced more repercussions given he was in a position of power over Lewinsky. But we all know the impeachment had nothing to do with that. Newt Gingrich was doing the same kinds of things after all. It was all just about impeaching Clinton on anything they could find to impeach him on and it was purely political. Had Clinton been removed from power there still would have been air strikes against bin Laden and against Saddam Hussein.
The intent behind Clinton's impeachment was 100% petty politics, there was no intent based on ethics, and what can we learn from it? Sexual harassment by a democrat will lead to scandal (but no real repercussions) while sexual harassment done by a Republican will not be a scandal and probably be rewarded by the base. But Clinton isn't running in this election but the "grab 'em by the pussy" guy is. So if you think Clinton should have been removed from power, why are you ok with Trump (who's at least as bad) regaining power?