Violent? Really? Do you people watch cartoons/video games or Power Rangers live action? iCarly is not violent.
It's funny and quirky and yes, sometimes Sam is very rude, but she's good at heart and incredibly loyal to Carly.
YOU are your child's role model so while watching, point out that Sam isn't very nice to Freddie sometimes and that friends shouldn't speak to each other like that, and they'll get the message. But Spencer, Carly, and Freddie are worth tuning in for.