So you are against uniformed police officers too?
Are ye daft, man?!
Those two situations are TOTALLY different..
Oh, nevermind....
Wow, you've got a really screwy view of the subject.
Uniformed police officers are effective against more-or-less law-abiding citizens (handing out speeding tickets, breaking up minor brawls, etc.) and when working openly en-masse against fleeing/resisting felons (high-speed car chases, dynamic entries/arrests, etc.) or other show-of-force situations (riot control).
Undercover police officers are effective in intelligence gathering (stings) and surprise takedown of major in-progress crimes. There are some crimes - like airplane terrorism - where the act is so heinous, and the perpetrator so determined, that the first thing done is kill ANYONE who may interfere with the commission of that crime.
Your local pot dealer will curb his acts when he sees a uniformed officer.
I complied pretty dang fast when, being bored and innocently playing with a video camera in NYC, I was questioned about "suspicious activity" by proffesionally & authoritatively (but not uniformed) federal marshals.
When infiltrating and preparing to arrest perpetrators of a high-value drug/mob operation, the cops do NOT wear uniforms lest they get dead quick. Heck, just wearing black sneakers can be a tip-off to the criminals.
When a half-dozen suicidal Al-Qaida madmen are he11-bent on killing thousands in a high-profile manner, the first thing they do is look for the "professionally and authoritatively dressed" air marshal - and kill him before he can react.
There is a place for uniformed and undercover officers. Hardened motivated terrorists will NOT reconsider their ways upon sight of a uniform, much less a suit.