Minaj fans are also mostly children and teenagers. They have no sense of proportional response when upset by something.
It is still however wrong when fans of something swat people, and yes; Nicki Minaj should be held accountable if it happens more than once.
Swatting someone is wrong in general, I don’t care how evil or wrong you think a person online is. This also goes for doxxing as well as threats or other forms of harassment.