So, okay, we played a football game Sunday. The other team kicked three field goals and my team lost by four points. So I say, "Wait a minute. If field goals only counted for one point, then my opponent would have scored six fewer points and my team would have won. It isn't fair. We should change the rules so that field goals only count one point."
We cannot, however, leave aside that if field goals only counted one point my opponent would not have kicked field goals, but would have gone for it on fourth down, made it two out of three times and scored two touchdowns, winning the game anyway.
You play the game under the rules that are in place, and the rules that were in place for this election were the electoral college. The candidates campaigned based on those rules and voters voted based on those rules. The popular vote cannot be considered dispositive when neither candidate campaigned in California, for instance, because the state was assured for the Democratic candidate, and when countless California Republicans did not bother to vote because they knew that their vote was utterly meaningless due to the electoral college process.
In an election that would be determined by the popular vote, both candidates would have campaigned in California, and far more California Republicans would have voted, and that's just one state. The Democrats need to accept their loss and move on.