We understood it the same way. Because as you say, it’s not logical that so many people can have the exact same karma. We can’t even all agree on how much sugar to add to a cup of tea!
If you would like some background on the suffering due to underdevelopment in political science we have decided that lack of development is due to poor institutions. These institutions allow for corruption by higher members of society to making it function, also known as greed. The way to get rid of this corruption? No clear answer! Every method devised since the 1970s has failed, it appears to mostly due to chance events that disrupt the ruling elite who loosen their grip on power and capital. All my friends were mad at this answer, and my Buddhist buzzer went off!
The good news is, according to a 2019 World Bank report, the poverty is declining despite greedy people ruling developing countries, likely by chance but we may find a cause in the future.
I would say it enters because you have control over it. It’s an intentional action that generates positive results. I don’t have my sutta book with me that has a few examples to cite, but it’s very frequent in the canon where having goodwill toward everything, if given wisely, can’t have a bad effect (worst case you end up in heaven for a few eons and fall back into the more unpleasant regions of samsara later). Therefore if you can forgive people for intentional and unintentional actions–for example unintentionally insulting someone because you accidently hit a sensitive topic–then you are doing a good action with a good intention (letting go of anger with the intention of building harmony).