Guns aren't tools, they are weapons. Second, making things ugly does not make anything more useful. Even if we all agree that aesthetics may not make a rifle better in function, we have to also admit that making things ugly does not make the rifle function any better.
Everything in this universe has many attributes and dimensions, this is reality, many different discriptions and values. The great difficulty to understanding is often the many ways to see, perceive, and the multiple dimensions to perceive, make a total and comprehensive understanding difficult to impossible. Often these many values and attributes are relative ton one another, often they are not. It is totally possible to have something fully aesthetic and fully functional. Possible to have something both purely ugly and totally worthless.
It also means the whole idea that we have to make ourselves numb or purposefully ignorant to these many values to focus on one value often leads to a world where we don't actually gain focus or understand the whole any better, often we just lose out, are made less by our lessened understanding. When it comes to guns throwing out aesthetics, or making a gun ugly on purpose, does not make our understanding or capability increase, nor does it make the gun more; it only makes the gun something far less in its totality.
Numbing yourself, limiting the dimensions of things you perceive does not make the man better focused on the "important" values, it just makes him less. This was the entire point of 1984, the Communists destroyed the language to destroy thought and limit thought and range of thought. Destroy words and language you force people to think only in the way you want them to think. Destroy the dimensions and all the ways to speak and think and you slowly hammer the man and his ability to think and feel down.
This is Cultural Marxism, the war on aesthetics is the war on everything to control your thoughts through perception. Don't let the talking heads fool you into thinking that destroying aesthetics of things makes them more functional, their only goal is to make less of everything to corner your thoughts and perception to control you. Everything form the language, to music, to home decor, to cars, to, yes, guns. You aren't making people better "operators" by attacking aesthetics, you are doing their bidding.
Don't fall for the other left wing general ideology of fake equality and its "If I lose Y I must gain X" mentality. We end up with retardation like "All ugly women must have great personalities to compensate for their lack of aesthetics" "Women must be smarter than men because they are weaker than men", "All beautiful people have bad hearts" and "All beautiful things must be evil" and "All good or functional things must be ugly".