Because apparently half of the active voters in this country are either greedy corporate cunts, wealthy sociopaths, MAGA morons, authoritarian Christian ideologue crazies, psuedo-intellectual "centrists"/independents that somehow conflate basic human respect for minorities and outright fascism as "both sides are the same", or some combination thereof. Those type of people are the type that think the ends always justify the means and that the ends they want is a US that looks like a cross between A Handmaid's Tale, Atlas Shrugged, and modern day Russia. It is one of the most disheartening realizations of my adult life to learn that so many of my fellow Americans are fucking vile people.
Do keep in mind, that roughly half of voters is not the same as roughly half of Americans. The highest turnout of voting eligible people in the last century was only 66.6% in 2020. Basically every Trump nut votes. It is there entire reason for being these days, to support and vote for Trump. And in 2020, Trump only got 46.9% of the popular vote, i.e. only 33.03% of the US voting eligible actually cast a vote for Trump. The rest of us are either actively trying to stop Trump or are at least not actively supporting him. The absolute BEST thing we can do as a country is to bump those numbers up. There is no excuse for 1 in 3 people to not vote, leaving another 1 in 3 people to have disproportionate power over everyone else's lives. Complacency and apathy or counting on enough others to do their civic duty so you don't have to is how Trump wins again. Vote and make every single person you know go vote too. Tell them to register. Tell them to vote early if that is more convenient for them. Whatever. Just go vote.
Update: The second best thing you can do is vote for state and federal epresentatives and leaders that will advocate for election reforms like joining the National Popular Vote Interstate Compact (NPVIC) and/or abolishing the electoral college, fighting Gerrymandering, establishing new, more fair and representative voting systems (Ranked Choice, Approval, Proportional, etc.), term limits, etc. The goal is for representative government is to actually represent the popular will of their voters. It absolutely does NOT do that right now. That should be our first and greatest goal for our government.