I know some of it is normal; lots of in-fighting, jealousy and misunderstandings between kids who are all eager to do well. However, the overall feeling I get so far from observing things is that the school and coaches have simply forgotten that they should be teaching "team first" concepts.
Most of these kids will end their sports careers in the next 2/3 years, especially the girls. I've been talking to more and more parents and am hearing that girls in particular drop off teams and for spring sports, rarely play out their senior season. I'm unsure if this is a generalization or a trend but it seems to be more true than false.
The chances of playing college level team sports is slim - which is of course why some players continually focus on their individual accomplishments; trying to make an impression, racking up individual accomplishments and focusing more on themselves than the team itself.
When my kids were little, we wanted them to play team sports to get important lessons, not because we thought they would earn a scholarship. They tried everything from soccer, to tennis, dance, and softball to find something they loved to play or do. We hoped the experience would teach them about themselves and give them the lessons from being on a team that will serve them for their entire lives.
When these kids get out into the workforce, how will they know how to be a team player? Do they even know the concept of sacrificing for the greater good or are they simply learning to be entitled, spoiled individual contributors?