Under pressure from a bipartisan group of senators, the Homeland Security Department last month increased the number of visas available for foreign guest workers seeking to toil in America’s seasonal industries, from seafood processing to resort housekeeping. Two critics of the decision, Daniel Costa of the Economic Policy Institute, a think tank that supports pro-labor policies, and Preston Huennekens of the Center for Immigration Studies, which advocates more restrictive immigration policies, come at the issue from different perspectives but agree that it’s bad for American workers and, in some cases, for the foreign ones.