Game communities vary in many ways, so its a bad to generalize all gamers as violent. For example, I like to distinguish differences in the halo community and the bungie, community. The halo community is vast, and can be annoying, but all of the content you can find in file share can be amazing. The Bungie community is a more mature community, and are actually aware and play bungie's older games such as marathon or myth. While in halo, you can find awesome maps that you don't find in paid dlc. The marathon community practically make games on their own, and spend years to make such scenarios. Just look atthis website
where the hub of the community is strong.
Ok, I may have gotten carried away with blabbing about marathon, but the point is, that there are nice gamers, rude gamers, violent gamers, social gamers, and anti-social gamers. I wouldn't assume the videogame industry is violent in general.