I HATE sparring newbies. And I would go so far as to say I won't do it too often, and not when I'm feeling a little out of it-- too dangerous.
Overall its easier to beat a newbie because you can get away with alot more commitment behind your strikes/throws, but still I have the same feelings as you Juan. There are several times they throw themselves at me so hard that the only way to ensure I don't get hurt is to hurt htem.
In tourneys, I actually enjoy fighting advanced division more. Its more cerebral and technique based and less GRWARRR SMASH. I have sent 2 different novices to the hospital, and felt terrible about it, but it was because they resisted my throw too much and landed on their neck or outstretched arm. Scary situations, and I tried to avoid them, but in the end I wanted to win, so I threw with some power and they ended up badly hurt. Not a fun time.