A B757 DIVERTS TO DEN WHEN A PAX BECOMES UNSTABLE; TRYING TO GET OUT OF THE ACFT INFLT. CREW IS RUSHED AND MISSED THE SEATBELT SIGN ON THE CHKLIST.

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PAX WANTED TO GET OUT OF ACFT DURING CLB THROUGH ABOUT FL300. FO WENT BACK AFTER REACHING CRUISE ALT. HIS ASSESSMENT WAS PAX WAS A BIG YOUNG MALE; AND WAS DISORIENTED; WITH WIDELY DILATED PUPILS. HE LATER GOT QUITE SICK IN THE FORWARD LAVATORY. WE COORDINATED A DIVERSION TO DENVER (WE WERE ON A FLT SCHEDULED FROM LAS- IAD). PAX WAS REMOVED BY PARAMEDICS AND POLICE. ALSO; ANOTHER MAN WAS COMPLAINING OF CHEST PAINS AND WAS ASSISTED BY PARAMEDICS. I WAS LATER DEBRIEFED BY FBI. THE AGENT SAID THAT; WHILE THE DISRUPTIVE PAX HAD NEVER BEEN VIOLENT ABOARD THE PLANE; HE GOT EXTREMELY VIOLENT AT THE HOSPITAL HE HAD BEEN TAKEN TO FOR EVALUATION. THE DECISION TO DIVERT WAS BASED ON THE POTENTIAL FOR THE MAN TO GET VIOLENT AND HARM HIMSELF OR OTHERS; AS WELL AS NOT WANTING THE FLT ATTENDANTS TO HAVE TO BABYSIT HIM FOR 3 MORE HRS. WHEN HE GOT SICK; THAT MADE THE DECISION FOR US. IF THERE'S ANYTHING TO BE LEARNED FROM THIS; IT'S THAT AN IRRATIONAL (FOR WHATEVER REASON) PERSON MAY BECOME VIOLENT AT ANY TIME; WITH NO WARNING. ALSO; WE STARTED OUR DIVERSION FROM A POINT 85 MI W OF DEN; AND IT WAS VERY; VERY BUSY IN THE COCKPIT. I FORGOT TO TURN THE SEATBELT SIGN ON; NOT NOTICING IT UNTIL ARRIVING AT THE GATE. WE ACCOMPLISHED ALL OUR CHKLISTS AND I DON'T THINK ANYTHING ELSE WAS OMITTED. WE DEFINITELY WERE RUSHED; WITH ZDV AND APCH TRYING TO GET US DOWN. IN A SIMILAR SIT I'D TELL THEM WE JUST NEED MORE TIME TO MAKE A NORMAL DSCNT.