The Troop level when Biden took over was 2500. The Taliban were winning provinces while Trump was POTUS. They just didn't attack American Soldiers. Keeping Bagram would be idiotic and strategically ignorant.
You missed a few steps...For starters, explain Trump's plan to leave Afghan after his agreement with the Taliban in Feb 2020 that allowed for the release of 5,000 Afghan prisoners who re-joined the Taliban.
TRUMP REVEALS HIS MASTER PLAN FOR AFGHANISTAN: WE SHOULD'VE "LET IT ROT" Tuesday, August 31, 2021
Donald Trump has had a lot to say about how Joe Biden has mishandled the withdrawal from Afghanistan—but, when given the chance to explain what he would have done differently, Trump’s master plan boiled down to leaving the country in smouldering ruins before leaving it forever.
The ex-president appeared on Fox Business on Tuesday morning to get some things off his chest a day after the last U.S. troops left Afghanistan. During a curious rant about how he believes unnamed shadowy forces are controlling Biden, Trump shared his alternative withdrawal plans.
“It’s something that’s rather incredible,” he said. “They [the people supposedly controlling Biden] do horrible things, vicious things. They cheat, steal, lie. But they can’t do a simple withdrawal from a country that we should never have gone into in the first place... We should have hit that country years ago, hit it them really hard, and then let it rot.”