Mainly because there is no such offence in the UK, and long may that continue.
If the cyclist knew the light phases, knew that he was crossing with a pedestrian phase, then I can't see how his actions were in any way risky to either himself or anyone.
Personally, I am already of the view that the law should be changed to make red lights the equivalent of give way junctions. Paris recently allowed right turn (equivalent of left for us) on red lights for cyclists, and it seems to have worked fine, so we could start with that.
The cyclist broke no laws, and as far as I can tell, posed no risk to anyone.
In other situations at other junctions he would obviously have been an idiot to have tried this.
In future though, he should remount as soon as he is clear of the stop line, as it is crossing the line that is the offence, not crossing the junction.
Finally, I utterly reject the notion of collective responsibility. It's pernicious, and anyone who has a bad attitude to a road user based on something that they saw another completely different person do earlier, should hand their licence back immediately. I see terrible driving every day, but somehow I manage not to hate all drivers for it. People that say "I hate cyclists because some of them jump reds" is a moron.