I concur that some single military-aged males could be a problem, but would expect those to be primarily from the Mideast, north Africa or China, not from Mexico or farther south.
I understand if they are genuinely here looking for jobs and lied about seeking asylum but we have a legal entry system. I have zero respect for anyone who came here looking for handouts or to take jobs. I do have respect for those here legally who want to work. It seems like a lot of Americans won’t or don’t want to do jobs that actually make them sweat. Hispanics have a leg up in their ability to work all day in the hot sun and their willingness to show up. A lot of Americans have gotten fat and lazy expecting the government to provide for them.