What do you mean by 'more open'? Do you mean longer? That is obviously true. Do you mean fewer Border Patrol agents per mile? That is probably true, too. Do you mean number of illegals crossing into the country? Then that is false.
Illegals entering our country is a problem in its own right, not merely in relation to the ease with which terrorists can enter the country. But if you want to consider the matter in that light, then realize that we have to start somewhere, and that it is better to take care of the biggest vulnerabilities first. At least we should try to make the terrorists exert themselves a *little bit* when sneaking into the country.
Tuor