Right-wingers make it a partisan issue, by conveniently dangling the debt over any spending they dislike. Also, while you mention Biden’s debt increase, not only was Trump worse, but not all increases are equal in kind. If a president increases the debt to keep the country standing during a difficult period, sure, good stuff. On the other hand, if the president increases the debt just to provide tax cuts that mainly benefit his rich friends, then not so good, these aren’t the same in any way despite both being increases.