There's even been various propositions of bombing volcanoes to use as weapons during the 2nd world war! Both from the US side (Mt Fuji, Japan) and the UK (bombing Mt Vesuvius) see MPs discussing this.

The history of volc geoengineering has come with varying success and failures. But the geoethics of such decisionmaking has never been discussed. Many volcanologists support a precautionary approach, where deontological constraints weigh heavily over any benefits.