I hate people who treat them like some toys and fantasize about them. That makes me think they are in some sort of death cult. That they found socially acceptable way to love violence.
I would still get one for safety but it is a tool made for specifically one thing. To pierce the skin and rip through the inner organs of a person.
They can serve a good purpose but they are fundamentally grim tools of pain and suffering. They shouldn’t be celebrated and glorified in their own right, that is sick. They can be used to preserve something precious but at a price to pay.
You don't know the first thing about requirements engineering. Technically, these assault rifles are primarily designed to kill/injure people, it's 100% part of the stakeholder/requirements analysis in their systems engineering workflow.
An airliner is not designed to fly through the air. It's designed to transport people and cargo from A to B within a given amount of time. Flying is just a means to achieve it.