Gangs in general are considered a bad subculture as their beliefs and values purely consists of the support of criminal behaviour. Things that gangs do don’t necessarily benefit community/ area they live in.
In my opinion I think the music subcultures are good as it acknowledges all the perfect music that was played during the past or present. It gives people who like the same genre of music a community to go to.
The reason why some fandoms are bad, and some are good all depends on the fan base. For a fandom to be classed as good, fans must be able to support and help one another in their community whereas as a bad fandom have fans that attack other fans from other communities that necessarily does not like the things the other fans like.
It also depends the criticism.
