请教一句《绝望的主妇》里的台词

第一季第17集中lynette的双胞胎儿子得了虱子，为此另一个主妇不让双胞胎去参加她儿子的生日party。lynette为了证明自己的儿子不是虱子的源头去找护士询问真正的源头是谁。护士不同意。于是lynette说到:"Acting like parents won't assign blame is like pretending they don't keep score at pee-wee league games. It's human nature. If you don't give the moms someone to blame, they'll pick a scapegoat. I can't let my boys be the scapegoat."
后面的话我理解，但是第一句话Acting like parents won't assign blame is like pretending they don't keep score at pee-wee league games.该怎么理解呢？还请多多指教，谢谢。

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