an act of kindness and who's fault is it anyway?

It's officially approaching 1 year since i started driving on the streets of KL. It has been a barrel of mixed feelings to describe, one i can't quite put a finger on and say aha--

Since i started commuting to Subang for work since 2010 started, i am out of my home by 7am. Latest i've left home is at 650am with the intention of heading on to Federal Highway before the crawl starts to build up. The early hours work fine with me, dealing with sleepy and slow-ly annoying drivers on the road has helped to build up my patience.

The only times I am stopped on the roads are when I don't make it to the traffic light in time before it turns red. During which time I usually ponder and wonder about the things around me. Mornings work great for me. I am most alert, happy, resourceful and peaceful during these times. I don't even feel the stress of the traffic jam or honking drivers unless I am absolutely late which I try to avoid at all costs.

This morning I was driving behind this motorcyclist - an uncle who was delivering papers. He was driving extremely slow and was in the lane I was driving on. He had some space on his left lane but he kept swerving to the direction where my car was heading to. The traffic on my right was full of vehicles. So with no choice I followed him behind. Traffic light is about 50 m ahead of me and the moment I was reaching, the light turned red.

The motorcyclist now, already swerved to his left lane continued on his journey as he made it there when the light turned yellow. Alas for me... I was stuck till the light turned green again.

This situation struck me like a bolt! I was trying to be kind enough to not honk at him and when it was convenient for him, so conveniently he swerved on to his lane and he was well on his way. Where does that place me?
What could I have done differently to change the circumstances and in turn made it on time at the traffic light?
Would that have affected the motorcyclist and even if it has or not, would I have stopped to even think twice about it?

And last but not least... why do I have to be so kind and allow these people to go ahead of me?
Would the law of Karma turn around and work in my favour at times when I need it?