I gotta be honest, this post reads like "just driving by I knew how to fix all these peolles' problems but they seem too lazy to care". Is it possible there's something you don't know about each of these scenarios? It's easy to construct some self congratulatory narrative when you're visiting a poor country, but it's also a trap. In the past, these narratives tended to be biological. Now they're "cultural" but the effect is often similar.
Take the pipe example. Maybe the police don't let people just "crowd fund" repairs to public infrastructure and perform them themselves. Maybe what you saw on the video isn't representative of the whole problem, or your assessment of the repair difficulty isn't accurate.
Perhaps your brilliant idea about pricing and selling ecotourism booklets isn't such a great idea after all. Maybe they already tried it and tried different price points and were too polite to tell you. That's common in "development" projects where there's a power/wealth imbalance between the person giving well meaning advice and the folks receiving it.
Speaking of which, maybe home repairs that look cheap when you're driving by aren't actually cheap by local standards. Perhaps the materials aren't affordable or people have absentee landlords that don't take care of the place because it's not in their interest to do so. There are plenty of buildings like this in SF but the reason is economic incentives, not a culture of apathy.
Who knows what's going on with your friend's construction business. As an absentee foreigner they may rely on a foreman who pockets a bunch of the workers' pay, making it a shitty deal for the workers.