We’re playing a video game based in Japan, and shit, it’s true that those scary masks are intimidating. After you break the mask, they just seem normal and easier to defeat. Our brains are weird.
Hell, it’ll dehumanize yourself and make you into a monster. A man becomes different when he’s behind a mask. Having your best soldiers mantle the demons and discard their inhibitions makes for a terrifying fighting force.
That and it generally was only the rich guys that could afford the bad ass armor that didn’t just look cooler, it offered better protection. You’d definitely feel stronger if you thought nothing could hurt you.