Nonetheless, lots of shooters like them black, and even call it "evil black rifle disease." That goes right along with research showing black as an intimidating color, which attracts and holds attention. It causes people to focus on it, and garners more aggressive behavior.
Great for a SWAT team, not so good for shooters, unless a lot of attention is what they want. Seems to be the case. There's lot of posts about "look at my evil black rifle." Apparently they feel empowered.
To me, black is just the guy version of a hot pink hello kitty gun.
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As for the man keeping us down, you got to wonder why not "evil white rifle disease?" There are a lot of cultural issues involved, not to go there further.
Trying to find psychological reasons why hardcoat anodized aluminum and inexpensive UV-stabilized reinforced nylon are black is like trying to find psychological reasons why car, truck, and tractor tires are black, why carbon fiber is black, and why stainless steel is silvery when polished and light gray when unpolished.
It's the natural color of the materials, and making them any other color costs extra. (Yes, you can make car tires out of yellow rubber, royal blue rubber, or OD green rubber, but the UV stabilizers are much more expensive than carbon black, and few are willing to pay for the cost difference.)
A Type III sulfuric acid hardcoat anodized aluminum receiver is black, period; the porous surface traps lubricants and protectants very well, but it also traps light. To make it OD green, olive drab, pink, whatever, you have to fill those pores with some sort of paint or dye, which requires more raw materials, labor, energy, and QA.
Likewise, a typical factory-parkerized steel surface is dark gray when dry and black when oiled, and for the same reasons---a parkerized surface is porous, soaks up oil, and AFAIK is fairly hydrophobic, but it also absorbs light unless painted.
If you like colored finishes, great! No problem with that; I think colorized guns are neat looking. But don't imagine that everyone who sticks to basic black---whether the topic be guns or car tires---is doing so in order to look like a ninja, or because of subconscious cultural/racial hangups.