Prove it. Unless you have proof of that happening incorrectly hundreds of thousands of times under Biden, then it's not any worse than Trump just letting them run past without even stopping or checking who they are lol.

How is "not arresting/checking someone AT ALL" any better?

Well yeah, because it's already secure right now. Biden started arresting 4x more people than Trump right when he took office, people that Trump was just letting run past without even stopping them:

Added appropriate edits for J Pow