BTW The Ford F-350 starts at around 2.5 tons curb weight so this Hummer is not without precedent. This kind of vehicle is meant to look big and imposing to project a certain image.
(Edit:as Kobe-systems mentioned, I mangled the conversion on the F-350 weight. Corrected)
Sure, you want to project a certain image, but you might also need to tow Very Large Objects.
This is definitely not the case for the Hummer, which has less tow capacity than an F-150.
Which is ~2.8 US tons, or ~2.6 metric tons.
The heaviest possible configuration is 8,587 lbs, which is still "only" 3895 kg, or 3.9 metric tons.
[0]: https://www.ford.com/trucks/super-duty/models/f350-xlt/
I agree. There are, of course, a few people that drive an HD truck as a daily, but it's not the majority by any means. They make awful daily drivers. Very thirsty, bouncy, steers like an aircraft carrier, etc. But for towing, they're pretty great.
Actually modern trucks got so big to get around Obama-era fuel efficiency standards.