It is a stupid naive political move which I wonder if they've done under pressure from the US.
Storming the soverign territory of Ecuador with only a wafer thin/dubious legal justification will have massive consequences. Can you imagine if a Chinese dissident claimed political asylum in a UK embassy and the Chinese said the same thing???? Why not? We ignored Ecuador's territory. How can we say it's unfair if China did it to us?
Also. Why did we not storm the Libyan embassy or ignore diplomatic immunity when that Libyan shot our policewoman a few decades ago but we're willing to do it for someone who has committed no crime in the UK?
I agree with Itsfine. Just wait. He will have to come out eventually. He can't stay inside forever. He's effectively imprisoned himself.
The more we do things like this, the more it does start to look like some US witch hunt.
Look at the trial of Kimdotcom who ran megauploads. Despite the fact he lives in New Zealand, the US are trying to extradite him having stormed his house with armed SWAT teams in a dawn raid, with illegal search warrants and illegally removing evidence from the country. The first judge resigned commenting "we have met the enemy and he is US." His alleged crime? Copyright infringement. Not murder...not drug dealing....copyright infringement.