They probably are aware of nuclear waste and of the modalities of dealing with it, and still believe that not investing into nuclear is shooting yourself in the foot.

FYI, a typical 1GW nuclear plant produces 30 tons, or 10m3, of high-level waste. Germany uses ~500TWh of electricity per year. So Germany could replace all their electricity generation with 60 nuclear plants and would need to find space for 1800 tons or 5km3 of waste per year.

For comparison, German landfills can accommodate 70M metric tons per year.

France, a country famous for its investment into nuclear, is not covered in nuclear waste, and does not seem to have any issue disposing of it safely.

Nuclear has its disadvantages, but painting the many people who advocate for it on HN as delusional or ignorant is not very respectful.