While the federal government has passed many laws over the years which encroached upon authority given to the states by the Constitution, federal reciprocity would not constitute such overreach. In fact, article 4, section 1 of the U.S. Constitution explicitly requires recognition of all states’ acts by all other states (also known as the “full faith and credit clause”). Hence, not having federal reciprocity is actually contrary to the Constitution.
While legislation to acknowledge firearms carry permits in all 50 states, the same way such recognition exists for drivers licenses, has stalled in the past, many citizens are concerned about their safety now, given recent events. Support for federal reciprocity legislation may thus well be growing.