Can you explain the reasoning behind the Electoral College being established in the first place? If so, then you will have a starting point towards understanding.
I actually have a problem with the EC, because it doesn't do enough to protect against tyranny of the majority. It's just that there doesn't seem to be a better system evident that solves all the problems.
Nevertheless, many of the complaints about how it causes politicians to focus personal attention on a few swing states instead of broadening their attention, are blaming the wrong thing. It isn't a problem that the EC caused. The cause is the geologic and demographic breadth of the US electorate. The US is too large and diverse for politicians at the national level to spend adequate time with each faction in each state. If it were popular vote, national politicians would have little reason to visit what are the swing states now.
That became evident in the 2016 election. We've discussed this here before. Hillary could have won in 2016 if she'd have spent more time in the swing states that she ended up losing. It's been reported that she was confident that she'd win the election, but was worried that she'd lose the popular vote. So she campaigned in the dense population centers, and she got a crap ton of votes from those dense population centers. Didn't matter, because they were from the same few states which she was already going to win.
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