I'll just put everything into one comment.
As for ADCs, it has become the least desired roles simply because, despite being a carry role, it is also the most team-reliant role. Yes, the ADC relies on the team even more than the support to do their job properly. Being glass-cannon, sustained damage, they rely on their team to keep them alive long enough to effectively serve as your team's main source of attack damage. Between the APC and ADC, APCs generally have better kits in terms of "solo" play.
Hawkman6879 is right in that, a lot of times, attempting to gank a fed enemy can simply make the situation worse unless it's guaranteed to go in your favor. However, adding a bit of jungle presence here and there is always a nice thing.
I think what OP is getting at is the tendency of many players to look to blame their team for their own individual shortcomings rather simply accepting their share of responsibility for the loss (ie. Players who lose lane blaming jungler for not camping, ADC blaming support and vice versa. junglers blaming lanes for losing highly unfavorable matchups with little jungle presence to compensate). In this case, your best bet is to ignore them and focus on self-improvement. The ragers will rage even if you finish the game 14-3-14 186 cs. Let them. Just make sure you don't stoop so low as to become one yourself, and focus more so on your own mistakes instead of what your team could've done better (Chances are, you won't ever play with them again anyway).