[Site Behaviour] Users must be a certain level to downvote

Why not disallow downvotes until a user's level has reached reasonable threshold (say 5 or even lower)? This means that someone who is completely new and inexperienced couldn't just start downvoting things without really understanding how it works (some work has to go into contributing before your voting voice is heard). Those who just want to lurk can still level up some without posting and they can still read things (which is the point of lurking, right?).

I'm not married to this idea, but I think something like this would be worth consideration.