Should public servants (like school teachers, hospital workers, trash collectors) have the right to strike?

Yes, like everyone else we're all human beings no matter what occupation you are, you should have the right to strike if you are being mistreated by your superiors or others. Imagine if  you were in a situation where get mistreated or get paid lower than everyone else although you been doing a good job, would you take it smoothly? Every job is important even if doesn't look like it. For example pen, pencil, and papers are small objects, but are used world wide everyday. So just because something is small and doesn't look important doesn't mean that it isn't, and its the same thing for public servants.

Should mandatory (or voluntary) prayer be permitted in public schools?

I think that mandatory(or voluntary) prayers shouldn't be permitted in public schools. My reason are because other people might feel uncomfortable or even scared. Prayers are harmless to people but it show what religion you follow and that can make people uncomfortable or scared. For example around the 12th century where Muslims and Christan fought for the holy city of Jerusalem (ex. Kingdom of Heaven). Although that was century's ago I think its best to be safe than sorry. Also we shouldn't force students against their will who don't want to practice prayers if they don't want to.

Should pornography be restricted by law?

I would say no, because some people consider it an art and others can use it as education learning experiment for future references. For example, the statue of David made in 1504 by an famous artist, Michelangelo, the statue of David is now one of the most renowned works of the Renaissance. One more example would be health classes in high school. If pornography was restricted by law then, sex ad wouldn't exist and underage teens wouldn't know how to protect themselves from Aid's, HIV, STD and pregnancy.