Finding that elusive common denominator

Canadians love to think of their country as being multicultural, diverse, unprejudiced, unbiased, etc., etc. Our federal police, the RCMP, are doing everything they possibly can to avoid being seen to draw the wrong conclusion:

Staff Superintendent Pauline Tumble: Wait, Sarge! The stupid floorsweep may be on to something. Look at those names: Fahim Ahmad; Zakaria Amara; Asad Ansari; Shareef Abdelhaleen; Qayyum Abdul Jamal; Mohammed Dirie; Yasim Abdi Mohamed; Jahmaal James; Amin Mohamed Durrani; Abdul Shakur; Ahmad Mustafa Ghany; Saad Khalid. Do you see the pattern?

Sgt. Warren Bollard: (adjusts glasses, peers yet more intently at the intricate graph) Yes . . . yes, I think I do see something. Something that rather leaps out at one, once one strips away all the distractions surrounding this confounding and inexplicable case!

de Funt: (still sweeping) Dey is all . . .

Sgt. Warren Bollard: They’re all male!

Hat tip to Martina P. for the link.