SPOILER ! My one (key) problem with Usual Suspects

Rating: 8/10 (6 May 2012)

Let me say first - I loved this movie from beginning to end. Well written script, superb acting, great direction, good pacing. BUT...and I mean a big but - AND A BIG SPOILER - stop reading now if you have NOT seen this movie...
The whole point of Keyser getting these guys together is to kill the (supossedly) one guy in the whole world who can identify him. OK, great. But now Keyser just sat in a police detective's office for two hours. Now there's a cop out there who knows what Keyser looks like. (Plus there's a second cop who spent a lot of time with the surviving suspect too.) Doesn't this just defeat the purpose of Keyser's whole plan? Now granted, maybe Keyser did not plan to get arrested. That's the only thing I can think of. Still - big time "cheating" on the twist.