ok, but I find this simplification to be what is lazy. Obviously the world isn't as clear cut as only those 3 groups as if they're not intertwined.

And what does "directly responsible for polluting the environment" even mean? If I pay someone to take my trash out and throw it in the ocean am I all of a sudden excempt because I'm not the one "directly" polluting?

Pollution comes from a complex system so it has to be solved as such. Blaming individual participants (specially the ones with less money and power) is reducing the responsability of the rest which is the perfect excuse to do nothing

I'm furious because I see a non-stop behavior of consumers dumping their garbage, either in nature, or in municipal waste sites next to bins because they're too goddamned lazy to literally lift up their arms - let alone not sorting garbage for recycling.

And this is in a major city in middle Europe, one of the centers of "civilization".

If it's this bad here, what must it be like in countries with less developed social and economic systems?

This is the core of consumer responsibility, and it's a dismal failure.