Why do schools block the word "gun" when you type it into google?

Why do schools block the word "gun" when you type it into google? In my school, if you go to google and type in "gun" it goes to this... show more Why do schools block the word "gun" when you type it into google?

In my school, if you go to google and type in "gun" it goes to this webpage:

http://10.10.20.102/globalblock.html?URL=http://www.google.com/search%3Fhl%3Den%26q%3Dgun%26safe%3Dactive&IP=10.72.7.93&CAT=WEAPN&USER=DEFAULT

Why?
Its like the schools are against the first AND second amendments

(I think they keylog everything too)
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