Footprint of spent nuclear fuel is laughably small when compared to other industrial processes and it can be reduced even further by using fast-neutron "burner"

Footprint of spent nuclear fuel is laughably small when compared to other industrial processes and it can be reduced even further by using fast-neutron "burner" reactors. Why do you complain about nuclear and not about "immortal" heavy metals, which have several orders of magnitude bigger impact on ecology and human health?