Numbers 1, and 2, in short no.
Number 3, Welcome to Aurora.
Number 4, yes they most likely are trying to ram. While the player can't ram, NPRs and civilians can ram but don't always.
Number 5, I am not sure what the question here is. Venus has an incredibly thick atmosphere and as such its much much denser than our own.
Number 6, I am actually not sure about that.
A little bit of a longer answer on the interrupts is its a feature of the game. It wants to give you a chance to do something about a perceived problem while you still can do something about it. They can not be shut off.