as much as I strongly dislike both alonso and ferrari it did look like hamilton deliberately held up at the line to allow himself to go through and not alonso. I'd be interested to know if the FIA (no longer Ferrari International Assistance it seems) have listened in to radio comms between hamilton and his crew.
I don't think he deliberately held up Alonso. It looked to me that Hamilton was unsure of where the line was, ie, had he passed it or not, and also how the rules worked. Once he saw the line, he went for it, but lost.
Don't forget, these cars are very low and the drivers field of vision is extremely low when it comes to looking at things on the ground.
And anyway, he got penalised, served his sentance and then got on with the job.
Even if he passed the line fair and square, Alonso would not have had enough time to do the same. This incident just gave him an excuse to sound off.