Does anyone know what "Glacial politics of death" means?

If you have any context, that would help be more specific.

When something is described as “glacial” it generally refers to a very slow but inevitable movement. Until climate change became more pronounced, glaciers were know for moving feet a year, but inexorably moving to the point it can carve new landscapes.

I think it is that new good laws get defeated in government.

Are you sure you remember it correctly? I think it would make more sense to say something to the effect of, “The glacial death of policy is inevitable, due to divisive politics.” Maybe you could ask for clarification?

Politics related to death are moving very slowly e.g. right to die, death penalty.

I would go with @Here2_4 on this one. What she writes makes sense.