No matter which side wins the Kansas school finance lawsuit, we already know who loses: Kansas schoolchildren. The last time schools won a suit, the state lowered its standards for schools. Talking about school spending is easy, even though most Kansas public school spending advocates refuse to acknowledge the totality of spending. (Or if they acknowledge the total level, they may make excuses for the spending not being effective.) Advocating for more spending is easy. It's easy because the Kansas Constitution says the state must spend on schools. Parents want more spending, and so do teachers, public employee unions, and…