It is NOT a minor event. Niger is the main source of uranium for France, the US has military bases from which they can project to the Sahel, like the other coup governments in the region it seems they are close to Russia, the threat of a military intervention by the ECOWAS in behalf of the west has the potential to drag most of west african states into a bloody war. You may not agree with the coup, you don't have to agree, but you should not dismiss it. It has the potential to provoke a major conflict in Africa in which Russia, France and the US may be involved just like in Syria or Ukraine.

US bases, uranium and gold for France and the EU and transfer country for a planned 20bln cube gas pipeline from Nigeria to Algeria (and then the EU).

Essentially they're mad about the stream of critical colonial loot drying up.