On a more reasonable note, try:
- "The world is watching, so we better not let him get away."
- "If he uses the embassy to avoid charges in such a public manner, could set a 'dangerous' precedent."
- "The UK will have 'egg on its face' if they let him use this to get away."
- "We need to save face, the world is watching."
- "This guy is pissing me off. I normally wouldn't care too much, but he is flaunting his situation to the media, so I can't back down now."
- etc...
No one is saying that "The Media" specifically called for this sort of action. It's the "eyes of the world" that limit options. If this wasn't all over the news, it would be more likely that they might just let him go, but with the world watching "THEY ARE LETTING A CRIMINAL GET AWAY!!!" would be the next headline were they to let this slide.