Why won't ship on ship collisions cause any damage?

when two ships run into each other, one will eventually just slide off to the side and both ships will go off on their merry way completely undamaged.

the only way one ship ever gets damaged in any way is if it is a DD being pushed over enough to take on water by a much larger ship and then it gets damaged only from the flooding.

the poor damage models on ships cannot be blamed for this simply because the random and different locations of these collisions would eventually cause damage somewhere but it doesnt.

i have to therefore conclude the game must have some setting to ignore friendly collision damage since friendly fire will and does do lots of damage in the game.