This is an old argument with unclear answers, but third world countries are a thing for many reasons and you can't dismiss their woes. Excusing it with "we were also poor once" is nonsense.
Not dismissing anything. Just wondering why they haven't managed to deal with their problems while we did, even though we were dirt poor until very recently too.
I'm sure there are absolutely no geological or hydrological difference between the Netherlands and Bangladesh. It must be because they don't go skiing or snowboarding.