Metal is not lefty. But INTERNET metal and its faggot communities very much are. The longer that metal subsists as an internet-only phenomenon, the more faggotrated it will get.

Example: Nuclear War Now is a decent label reissuing mostly quite based bands. Extreme metal, we're not talking Pantera here (ironically Phil Anselmo might be very based but w/e). NWN had some of the best forums for metal discussion on the net. They shut them ALL down when a guitarist from a black thrash band trooned out and started getting mocked. The single point of failure was the US based Jap owner deciding he didn't want to deal with internet drama. As a result, just a bit more real metal seemed to disappear from the internet and metal overall seemed to become more trans friendly. But it's just a faggot net illusion which commies are droolingly eager to capitalise on. Multiply this effect and you have what you have now.