I view the semi-auto UZI with a 10 inch barrel as a platform for a suppressor, a way to achieve suppressed fire at distances exceeding pistol ranges.
A 10 inch barrel SBR UZI with a suppressor and sub-sonic ammunition will be a reasonably quiet weapon and a stable shooting platform for 100-200 meters.
What semi-auto pistols (with normal/typical barrel length of 4-5 inches) out there would you be comfortable trying to shoot at 100-200 meters?
The UZI is a reasonably stable firing platform, offering adequate/acceptable accuracy, in a compact and maneuverable package, with firepower superior to the basic pistol as the UZI standard magazines are 25 or 32 rounds.
For use in/around a vehicle the UZI is an excellent choice.
Another poster wrote-
Your enemy is probably "poor" like you and isn't able to get the latest equipment. He might make improvised body armor it may stop certain pistol ammo from certain ranges. Maybe down to 100 meters or maybe even 50 meters.
Well body armor is not particularly expensive, you can go to a gun show and find Interceptor OTV for $200-300 with the soft level IIIA inserts, Improved Interceptor OTV with the soft level III-A inserts for $400-$500, and then add in the level III or level IV plates for about $200 to $600 per plate (depends which plates you want to get, some claim to be able to take 60-65 hits of 5.56mm NATO before they are compromised, these ones tend to run about $600 to $800, but the basic NIJ certified to stop 1 round of 30'06 AP –level IV- or 6 rounds of 7.62mm NATO –level III- can be had for as little as $200 if you buy them on sale or get them at a gun show/auction)
Even still, somebody wearing basic soft body armor, absent the rifle plates, is at least going to feel some pain and probably will go for cover if he starts taking hits to his body, even though his body is armored, because most people prefer not to receive gunfire. Of course you might run across some guys like those North Hollywood robbers who seemingly don’t care about how many hits their armor takes, but that’s not a normal human response to receiving gunfire.