To be honest - I dont think the manturity level of S2 is getting any lower than it was before.
If you think about percentages - it would most probably be exactly the same.
If say, out of 1000 people - 50 of those are immature little idiots, if you ten fold that, 10000 people, 500 of them are immature little idiots.
Basically, I think it is just because the size of the community has grown.
Stop new S2 accounts signing up, in 5 years time they will all be mature...
Also - dont forget you are all older yourselves now - you were probably just like them