Because the electoral college is what needs to have a majority, not the general election.

The problem there is that the Constitution says the state legislators get to pick how electors are selected. They don’t even have to hold popular elections, even though all 50 states currently do. In fact, the Supreme Court hinted in its decision in Bush v Gore that state legislature can change the rules between the November elections and the actual election in December.

That is: Republican legislatures can decide to ignore the election results and send Republican electors if they don’t like the results.

Texas already passed a law allowing the Texas Secretary of State to overturn elections in Harris County (Houston).