Context matters, 15% failure rate for a weaopon is certainly often. Furthermore, what that means in the context of cluster munitions is that they just sit there long after the conflict is over, so when people stumble on them decades later they get maimed and killed.

This is currently happening in places like Vietnam that were subjected to these horrors by US. Now it's going to be the turn for the people of Ukraine.

Any pretenses that US actually cares about the people of that country have now been dropped.