Everyone seeking entry into the US is assumed to be an undesirable. That’s why you spend so much money on forms, records, financial statements, interviews, background checks, medical exams to legitimately come here - it’s on YOU and your sponsor to prove you’re not. Even legal and legit asylees undergo background checks. They’re not just allowed in to wander freely of their own accord. People who apply for entry either come in under the VWP (Visa Waiver Program) using an ESTA clearance - which means they’ve got a scannable passport that we can glean information about them from and they’ve submitted for advance permission to enter - or they’ve submitted preliminary paperwork for an entry visa through ICE and have been granted clearance to enter.]
If you enter as a refugee or requesting asylum, guess what? You have to wait to be checked out, even summarily, before we’ll just let you in the door. And you are held in a detention facility until that clearance is granted.
And rightfully so.