The term Nihilism is unhelpful here. In some cases what we have is a form or derivative of Nietzschean where the focus is on an intoxicating aesthetic (indeed the pursuit of this aesthetic, itself arbitrary and like all else unjustifiable, becomes the sole imposed telos of existence). Even if they do not consciously admit this to be the case/or take it to its logical conclusions it is this kind of 'Nihilism' which has a big place in the alternative music community. There's a number of reasons for this e.g. the traditional Dionysian role of music and the historical influence of Nietzsche on Euro-Paganism and the counter-culture right.
Huysmans is a different case. As an individual he was neurotically sensitive to both visual ugliness and beauty. The French Naturalist school of literature from which he emerged also made a point of focusing on the most grimy and downbeat aspects of modern life as a way to scandalize and (sometimes) raise awareness of social corruption. Husymans took the same approach first to illustrate the philosophy of Schopenhauer and later the truth of a certain kind of Catholicism.
I wouldn't deny this connection, however ultimately the two are incompatible. Like any political system Fascism must contain normative elements which of course are incompatible with the denial of objective values.
Productive of what?
There is as much reason to laugh as not to laugh, that is none at all. People still have a tendency to dive for moral indignation if one laughs at or wills the suffering of others however.