I wish I went to a private school, you get to carry knives. If you get caught with a knife here you get expelled.
I'm not rich though so my parents cant afford it.

I suprised your krav maga instructor told you that; I was once told by a krav maga teacher that you should fight to protect anything, even the soil you walk on.
I was kind of suprised since it is such a down to earth martial art.