Why does metal musicians sometimes wear red armbands like Arch Enemy and Nikki Sixx?

Metal musicians like Arch Enemy and Nikki Sixx wear red armbands as a symbol of solidarity, often representing their stance against oppression or as a nod to political and social movements. The armbands can also serve as a visual element that complements their stage persona, enhancing the theatricality of their performances. Additionally, they may evoke historical references or personal meanings unique to the band or artist.