If their next best option to working at an Amazon warehouse is starvation, then it's a pretty good thing for them that Amazon has a warehouse there. That said, I strongly suspect they have better "next best" options.
Funnily enough, we have enough food and shelter in the U.K. that this shouldn’t need to be a choice people have to make - the issue is one of inefficient resource allocation. Instead of noticing this and solving the problem, our Government have decided that if you desire any sense of dignity, you deserve to die.
Have some fucking empathy.