Probably a better question is why would Police Departments
want a 1911?
The only advantage of a 1911 - as working tool - over the SA/DAs is a very nice trigger. Probably a better question is why would Police Departments want a 1911? The SA trigger is probably of no little/nor value to working LEOs. Encounters tend to be at very short distances, and there's enough adrenalin pumping to take care of the DA to SA a non-issue. Fast double taps at 25 yards are more useful to sports shooters than anyone else.
I can't see any advantage - other than a "sweet trigger" - that a 1911 has over the SA/DAs or Glocks. I can see a lot of disadvantages.
Expense -- A reliable 1911 is going to be more expensive than a SIG/Glock. There are lots of folks who swear they get 1911s all the time that are 100% reliable out of the box - but there are a lot of folks that have to have feed ramps polished, try different kinds of mags, etc. to get a reliable 1911.
Complicated to use -- Cocked and locked means one more thing to forget when someone is shooting at you - compared to a Glock, for example. You have to drill constantly to make sure that you sweep off the safety.
They will not fire unless the trigger is pulled (and in the case of a 1911 the manual safety is disengaged and the grip safety is depressed).
Can that be remedied with training? Maybe. Are you as a taxpayer ready willing and able to pay for that training (in addition to the other training)? And for what purpose - to learn how to use a slightly more complicated tool that is no more effective than that the tool in current use? Say 10 hours of overtime every week for every officer? Budget increase of 37.5%? I think you'd find a lot of LEOs happy to get the
paid overtime.
On THR, the assumption is that LEOs are
mainly guys who get to run around with guns. But my guess is that to working LEOs, a gun it one tool among many - and perhaps the least frequently used tool of their trade. It's just another tool they need to work when they want it to work. The less training the better - they spend a lot of time training to use their other tools. Legal training, using their patrol cars, communications devices, social welfare bureaucracy, etc.
The folks that I know that like 1911s
enjoy endlessly tinkering with them. They
enjoylots and lots of training drills. The sweet SA trigger - for accuracy or bragging rights is the most important characteristic of the weapon. And I got to tell you that even among a large portion of those folks, the "have to go bang" CCW or nightstand gun is a Glock, or some other non-1911.
Mike