On the importance of objectives a.k.a Turrets > Raptors

So we all know the winning condition of the game is blowing up the enemy's nexus, right? Doesn't matter how much gold you have, what items or how many kills. Whoever loses their nexus, loses the game. Game Over. Sayo-effing-nara. And the road to that one single winning condition are the turrets and, even more importanly, the inhibitors.

Then how come so many players utterly ignore this? I have no idea what those people think, but when four enemies are sieging your inhib tower against two of your teammates, that's not the time to go clear a large minion wave because it "threatens" the oh-so-important second top tower. When your team won the teamfight and your are all still around half HP and dragons up, you don't ignore it to go get enemy Gromp. Hell, as a sometimes jungler, I want to ask others, how can getting wolves can be more important than your teammate top frantically pinging for help when they are 2v1 rushing his tower and his is at half HP? Or after an ace by the skin of your teeth, with 40 effing seconds to spare, people recalling instead of getting an inhib or two and then hauling a_s_s?

Seriously, I get it, farm wins games but there is a time and place for everything. That 300 g isn't gonna be worth anything if you let the enemy get your inhib instead of defending it. And the ace is useless unless you can get an objective out of it (enemy wolves and raptors, contrary to popular belief, don't effing count as such).

TL:DR Nexus Towers > Inhibs > Inhib Towers > 2nd tier towers/Baron/Dragon > Outer towers > ....... > farm Is it that hard to learn?