Parent arrested for tress passing at school

http://www.boston.com/news/local/massachusetts/articles/2005/04/29/arrested_father_had_point_to_make/

This is an article about a man arrested for trespassing at his son's school. He wanted to be informed when same-sex marriage was discussed in his son's kindergarten class, so that he could take him out of school.

I don't agree with this man's politics, but I'm very disturbed that a parent can be arrested for trespassing where their child goes to school. No where in the article does it make it sound as thought this man was a threat. Public school is generally far from transparent, and I certainly believe that parents should know what their kids are learning, and have the right to edit and enrich as they think appropriate.