You need to do some more research pal. All customers were searched for weapons of any kind prior to entry. Pulse was therefore a Gun Free Zone guarded by a lone security officer. He may have been armed but killer knew that and made him the first kill. After that, everyone in the club was unprotected and unarmed. Killer knew he could take out the guard and all others would be defenseless. Thus, a Gun Free Zone.
While you are doing your research, take a look at the Chicago crime stats. The gun control in that pleasant city has done wonders for the safety of its citizens.
Poor people have been voting Democrat for 50 years and they are STILL POOR.