Its really not dangerous at all. The only negative sides to inflating your tires to max sidewall (some guys go even higher) is a rougher ride and worse traction in snow. The positives are better traction on dry and wet pavement, increased steering respose, better tire wear, and better gas mileage.
Here is an interesting article that IMO should convince just about anyone:
http://www.officer.com/article/artic...on=19&id=27281