Interdiction has always favoured the aggressor. When you interdict someone you must keep their ship under your reticule while the tether buffets your ship. The buffeting is never very strong and the target simply cannot move much from your perspective due to the distances and speeds involved. Meanwhile when you are evading, the escape vector shifts about and can move away from your reticule at speeds far in excess of your maximum pitch rate. It's also much more likely to glitch out since it's not an actual object in the game world with set properties.
As far as AIs go, they have none of a player's limitations like latency or physical flight controls. It's actually harder to make them convincingly bad at something than it is to make them perfect at it.
