"I have looked at exactly that. The rate at which guns are used lawfully far outstrips the number of times they are not. As such, their benefit to society is easily a net positive."
This Harvard study doesn't think so:
http://www.hsph.harvard.edu/hicrc/firearms-research/guns-and...
Also, read this for your other arguments:
http://www.cracked.com/blog/the-4-most-meaningless-arguments...
Good debate. I gotta finish work on some software now. Take care sir.
Edit for your edit about rights: http://youtu.be/bx71U-1O-eY