Back in the early 1900's,, there were a few firearm companies who offered a suppressor as an accessory to a production firearm. Winchester, advertised them as a "chicken coop gun," if I recall correctly.
Modern designs have come a long way,, and as such,, there are many excellent suppressors out there. There is also some that do not work as they should.
I've had the good fortune over the years to have tried & used many different brands & designs. I've even had the honor of visiting a plant that makes them, (AWC) and testing some. I've shot a fair number of them in many calibers,, from .22 LR up to .50 BMG in a Barrett.
No, they are not Hollyweird quiet,,, but at the same time, many of them can come close. It all depends upon several factors. From the design of the suppressor, the method of mounting it, the action design, the type of ammo, to name a few.
Many LEO dept's use them for various jobs. Animal Control often uses one (as mentioned above,) to be able to not disturb the public. Tactical teams use them to assist in their various apprehension methods. The military uses them to prevent the enemy from locating them.
Practical use? Not as many of the general public can claim a NEED for one. Even in my job,, it would be a limited application. Why? I'm not allowed to discharge a firearm in city limits by most city ordinances.
Yet,, there is a practical use for them in the general public.
Gun ranges often get "noise complaints." This can assist in mitigating that issue,, allowing gun ranges to coexist with development.
Hunting is another use. The noisy discharge can disturb other animals when more than one target is allowed & legal. (Hog hunting comes quickly to mind.)
Teaching shooting to new people. Noise can scare newbies,, especially ladies.
And it has a health benefit in that by reducing noise,, you are helping protect your ears from damage.
So, they are a good tool when properly used.
Sadly,, they got lumped in with full auto firearm in the 1930's,, and really wasn't necessary. Add how Hollyweird has made them APPEAR to the public,, and it's hard to get the laws changed. Throw in the legal mumbo-jumbo hoops you have to jump through,,, and the attitude the anti's have,, makes it hard to overcome. Many folks feel it's just not worth the hassle.
The facts do not support the fears & attitudes most have towards them.
But they do have their place & should be allowed,, w/o such a hassle.