Last Sunday’s massacre by a lone gunman at a gay nightclub in Orlando, Fla., has riveted worldwide attention on the vulnerability of LGBT (lesbian, gay, bisexual and transgender) people, radical Islam, home-grown terrorism in the U.S., gun control and weaknesses in the U.S. security apparatus. While the attack will likely encourage clubs and other public venues to strengthen security, experts predict it could also galvanize politicians to pass the requisite federal legislation to prevent civilians from owning weapons of mass destruction. The Orlando shooting ranks as the most deadly mass shooting ever in the U.S. and the worst terror attack since the September 11, 2001, attacks on the World Trade Center in Manhattan. Omar Mateen, 29, born in the U.S. to Afghani parents, laughed occasionally as he fired from an AR-15 assault rifle and other weapons in the packed Pulse nightclub, leaving 49 dead and 53 injured before police shot him dead.…