There is a trade off here (of course) as in anything.

You can write the type heavy language with the nullable-type and the carefully thought through logic. Or you can use the dynamic language with the likelihood that it will crash. The issue is not “you are a bad coder, and should be guilty” but that there is a cost to a crash and a cost to moving wholesale to Haskell or perhaps more realistically to typed python, and those costs are quantifiable- and perhaps sometimes the throwaway code that has made it to production is on the right side of the cost curve.