One of the putative downsides of open borders is that immigrants might cause crime. According to this argument, immigrants are statically more likely to commit various crimes than domestic citizens, and for that reason, it is justifiable to exclude.
One response to this argument is to dispute the empirical claims. In fact, empirical studies generally find that immigrants are less likely to commit crime than domestic-born citizens. Bas van der Vossen and I will summarize the studies in our forthcoming book with Oxford. I’m not bothering to link to them here, though, because I want to ask, instead, what if immigrants did in fact cause more crime? What if immigrants were more likely to be criminals than the domestic population? Would that be sufficient reason to restrict international migration?