I'm noticing that everyone advocating that people should always watch videos for the more difficult content throw out the word "carried" whereas no one else does. Look, contrary to your popular belief, not everyone who goes into a fight without experience wants to be--or is intending to be--carried. I've joined groups where my only experience in the fight is having heard about it from others. I enter, tell the group that I'm new, and ask "Anything I as a <insert role need to be aware of?" They explain it to me in broad strokes (usually omitting something), and a minute or two later we run the fight. Should we wipe, I am rarely the first to die, despite being the least experienced. I'm not receiving special treatment from healers, nor am I purposefully keeping my DPS low--I'm playing smart. I am actively watching for patterns in the fight, paying attention to chat to see if anyone starts spamming a certain macro, keeping an eye on everyone's HP and positioning, looking for visual cues that something's about to happen, etc. If my DPS should fall because I'm not focusing on my rotations, like missing a switch to Umbral Ice and needing to Transpose or Convert, I'd rather have that than get steamrolled by Ifrit and have 0 DPS for an extended period of time.

I'm not saying that everyone can or will be that aware, just as I'm well aware that I'm not always going to dodge or win everything the first time. What matters is a willingness to learn from your mistakes, and to be open to the good criticism of others and take their advice. As I said before, my first-timers group (formed in about 10 minutes and titled in PF, "Newcomers preferred, no experience necessary; let's figure this place out together! =D") got stuck on Caduceus. We also had turnover at two points, either because some people's FC's needed them for a run, real life issues, or they just needed a break. It never ended in shouting or insults, however, just well-wishing. For the three of us who stayed, we were consistently doing a great job, and not because we were being carried, but because we were actively finding ways to play better. When something went wrong and we didn't quite understand what happened, we asked the group. If we know we messed up, we called out our own mistakes, and told the others what we would do next time. And we did that--even the experienced players would take responsibility for their mistakes. We all communicated with one another, encouraged one another, and became a tighter group.

tl:dr, It's not an issue of people wanting to be carried: it's an issue of communication.