I suspect the threat posed by the cluster bombs is far less than the threat by the Russian mines.It is possible to both decry the violence and poverty of war while still understanding its necessity in some circumstances. You don't have to be either a brainless patriot or a clueless pacifist. And it's legitimate to critique the US for engaging in war by sending aging cluster bombs to Ukraine no matter what their reason for doing so might be.
And Ukraine can keep track of where they drop them.