NYtimes: When Miranda Pakozdi entered the Cross Assault video game tournament this year, she knew she had a slim chance of winning the $25,000 prize. But she was ready to compete, and promised fans watching online that she would train just as hard as, if not harder than, anyone else.
The behaviour isn't caused by games - it's caused by an overall lack of compassion in today's society. Kids have too much power over their parents, and feel entitled to control and insult anyone they want. This is a failure on the parent's part, and not the responsibility of the gaming industry (in fact, I'd be surprised if there's anything they as an industry can do about it).