Under capitalism, a lot of the time, highly dangerous jobs are also highly paid. Kind of a balance that the individual decides to engage with. Same idea behind getting an advanced degree in STEM or law. I think of my job by example, I’m a power plant operator at a large combined cycle plant. No fucking shot I’d be doing this if the pay wasn’t good. I’m around explosive and deadly hot shit all day.
In socialist societies, more dangerous jobs are usually compensated by higher pay or reduced working hours. Such was the practice in the USSR, as an example. The USSR was a top competitor in the field of science, managing to go from semi-feudalism to space in merely half a century, so the idea that socialism stalls progress is faulty.
In communism, when all of production and distribution have been collectivized, and the productive forces themselves have been sufficiently advanced, people still work for their own fulfillment and to obtain personal enrichment for still-scarce non-necessities.
If you want to learn about Marxism-Leninism, I wrote an introductory reading list you can check out.