With Lathyrus it’s stated pretty clearly in the wiki article; it produces seeds when other plants do not, thus it’s still eaten especially when there’s no other crops. This has lead it to stay in cultivation and become part of some cuisines, which people still make because of tradition
If the problem manifests after years of consumption blame it on user error and not eating a balanced diet.
But why bother at all in this case? Funsies?
With Lathyrus it’s stated pretty clearly in the wiki article; it produces seeds when other plants do not, thus it’s still eaten especially when there’s no other crops. This has lead it to stay in cultivation and become part of some cuisines, which people still make because of tradition
Profit or philosophy but mostly good old fashioned stubbornness