You're still parsing it incorrectly even if this speech wasn't about the wall and illegal immigration.
"their rapists" only means that some subset are rapists because it's a category included with others. There is no hint that all of the bad ones he is referring to are rapists.
"their rapists" only means that some subset are rapists because it's a category included with others. There is no hint that all of the bad ones he is referring to are rapists.