You could say the same thing about a popular vote where a candidate wins by 10 votes - "oh, our entire system is decided by 10 voters? how unfair"
For the US election, votes in other states resulted in a situation where only 5 were swing states. If those voters in non-swing states voted differently in enough numbers, then there wouldn't be just 5 swing states.
Look at any of the elections in the past 40-50 years and you can clearly see that which states are "swing states" and which aren't changes over time.
However unlike in 2016, a strong plurality voted Trump - 2 million more than voted for Harris. Had Harris won the popular vote that argument might have meant something.
A few hundred votes slipped the US election in 2000 and caused the invasion of Iraq.
You tackle this by having societal norms and strong institutions. The internet broke that. The concentration of wealth broke that. The unprecedented algorithmic manipulation broke that.
Some love it.