The soccer games/practice is definitely organized. They were wearing uniform and they had coaches. The other issue is that grassy field was NOT designed to host such games and have an audience--it has no facilities to accomodate an audience like a sitting area or bleachers. It's just an open field. Ironically, there is a designated soccer field, about 100 yards away. That has bleachers. But they are not using that for whatever reason.
I am going to contact the city since they run and manage the park. As nice as it is to live in the OC, many people here, especially parents with kids are quite self-absorbed. I'm sure it is similar in other suburbs. You should see how they behave when picking up their kids from school. I dare not even ride my bike anywhere near school zones when kids are getting out! Yikes!