teaching your child after they come home from school

I am new to posting and this site.  I found this site only after trying to find a site I could cut and paste a story I started writing over 10 years ago, and did not want to take a chance in ever losing it.  I am glad to see a site with questioning parents!  So here is mine. 
Does it seem crazy to anyone else that when your child comes home from school, you look at their homework and notice that they are not correcting spelling errors anymore?  They tell me that as long as they can understand what is written it will not be marked wrong.  I have one child that will be graduating soon and another entering 2nd grade, I have been fighting the school for my older daughter for years and hoped and prayed that things would improve when my youngest started.  Should we not expect or better yet demand our kids learn the fundamentals of our language?