US asylum officers appear to be part of the problem
U.S. asylum officers urge court to end Trump’s ‘Remain in Mexico’ policyWhen 90 percent of the applications for asylum are rejected for cause it is clear that current policy is no deterrence to the bogus claims. Making people wait in Mexico could be a deterrent which does not allow them to move to the US and no show up for their hearings. What the asylum officers appear to want is allowing them in and doing nothing about their illegal status after they don't show up for a court hearing.
The officers said the policy is threatening migrants’ lives and is “fundamentally contrary to the moral fabric of our Nation.”