you should do some more english hw because this question is non sensical...are you asking for reasons supporting why they should or why they should not do hw?...i think that your mangled syntax is a strong indicator of why people NEED to do hw...
why hw needs to be done
1. enforces the point of the lesson
2. shows parents what is going on in class
3. allows students another chance @ successful academic experiences
4. provides teachers a way to see individual student weaknesses