But recognizing that fact doesn't mean that Biden caused the problems at the border.

Hmm...except for the fact that Joe Robinette Biden campaigned on welcoming immigrants through the front door...and rather loudly announced he was reversing every Trump-era policy that he could. Which he did, btw.

Or that it's a situation that rests entirely, or even primarily, with the Administration. For years, we have a mismatch between what the immigration enforcement system is set up to do (return Mexican nationals immediately back over the border) and what it needs to do now (process non-Mexican asylum claims).

Here's where I'll throw you a bone: No, Biden isn't at fault for the entire mess along the border - this has been a festering issue since Reagan. We've refused to fund real security along the southern border, we've refused to crack down on coyotes and drug runners, we've refused to go after employers who knowingly hire people who are ineligible to work and we still have states who pass things like this:

npr.org - Overtime farmworkers washington state agriculture

(WA state passed a law mandating a 40 hour workweek. But temporary agricultural workers want to work a million hours, get paid, then go home).