Wallace and Gromit said:
Anger or a desire for revenge? Most murders are solved, as victims and murderers are usually well known to each other or related. Thus, in advance of committing murder, a rational person knows the chances of being caught are very high. Yet people still commit the crime. People do not always act rationally!
Even with all that in mind... it took Floyd Landis just shy of four years to come clean. Four years! And on the scale of disappointments, Houvenaghel wouldn't come close. Houvenaghel worked hard for a spot at the Olympics, didn't get picked, got angry. Landis popped positive, lost a protracted court case, served out a ban and was made into a living, breathing scapegoat, an example to the Armstrong generation. And he tried to come back but was thwarted at every turn. Unwanted in any major team, shunned and discarded like a piece of used trash by the guy he had that information about for a couple of years, keeping his mouth shut.
And it still took him years to decide 'to hell with this, I'm gonna scorch the earth'. And another two years on top of that for it all to swing around in his favour to the point where he's not some jealous, bitter hater but seen as the block that brought the whole tower crashing down.
If Houvenaghel does have a story to tell, we shouldn't be surprised that she's not just started blurting stuff out after any setback. Besides, in the grand scheme of the Olympic summer in Britain, amongst the British press I'm not sure anybody would want to listen to her story anyway. Especially as it would be against the UK athletes, sorry, "Team GB" (ugh), not Team Sky, so wouldn't benefit from the anti-Murdoch feeling amongst other sections of the press.