Originally Posted by bbmike

Can you explain why? If one is crossing the road when not supposed to than it's their fault, just as it would be if pedestrian did that.

When riding on the road one has much less command over safety: you're moving much slower forcing others to pass you (passing is one of the most dangerous maneuvers), tiny(less visible), and with little defined path (less predictable). Just few of the reasons why some jurisdictions forbid cyclists to turn left.