my reply is going to be limited to the point sparring aspect, as i have never been directly involved with the "kickboxing" style of sparring.
IMHO, point sparring should be looked at like a game of tag. force and power should not come into play. it's about control and technique. this is the way i teach it anyway.
when you are squared off with another, the goal is to get a specific reaction out of your opponent. let's say i'm going face to face with a sparring partner. i always try to move in circles, keeping my opponent from aquiring a solid base. if i feint my rear leg wheel kick, my hope is that this will lead him to drop his hands anticipating the kick, which as a result has him dropping his hands, or moving them away from his center line creating an opening up top or down the middle. my goal as an instructor who frequently spars lower belts is to get them comfortable moving around, all the while looking for targets and defending against strikes successfully.
the injuries i've seen in the point sparring environment have resulted from a student displaying a lack of control. this is most prevalent in the lower belts. beginners have a hard time understanding the meaning behind point sparring. they think it should be "karate kid style" and beating the crap out of each other. this isn't our goal.
to paraphrase the above, the goals i strive to instill in beginners are that sparring is a game of tag, honing your skills of target acquisition, firing strikes from a moving base, and defending on the move. if your students are getting hurt while point sparring, my opinion is that they've never been taught the correct way to spar to begin with.