Because as close an ally as the UK is, the UK government likes to think of themselves as a partner and don't like to be bossed around or involved in too shady stuff, and UK courts certainly don't like to be meddled with.
Meanwhile, Sweden has a history of cooperating with the US on illegal renditions in violation of Swedish law and international treaties, to the point where Sweden has actually paid damages to at least one person - Muhammad al-Zery - who was tortured after Swedish police had handed him over to masked CIA officers at a Swedish airport and witnessed as he was stripped, drugged, chained and handcuffed and loaded on a plane to be flown to Egypt where he was tortured.
Said person was in Sweden applying for political asylum.
It caused diplomatic incidents when it was first revealed to the public and Swedish authorities "put a stop to it". Then shortly afterwards, Swedish military intelligence uncovered that it was still ongoing with the knowledge of airport personnel. At least officially without the knowledge of the Swedish government.
Maybe they've stopped now. Or maybe the units that participated in it are just better at hiding it, or maybe the US government is just better at making sure said Swedish government units have better reasons to deny knowledge.
But the fact remains that for sveral years, the US extracted prisoners from and/or transported prisoners through Sweden illegally to hand them over to regimes that would carry out torture in violation of both US and Swedish law and international treaties, with the complicit knowledge of the Swedish government.
It's quite possible the UK did too. But which government do you think the US cares the least about jerking around?
Meanwhile, Sweden has a history of cooperating with the US on illegal renditions in violation of Swedish law and international treaties, to the point where Sweden has actually paid damages to at least one person - Muhammad al-Zery - who was tortured after Swedish police had handed him over to masked CIA officers at a Swedish airport and witnessed as he was stripped, drugged, chained and handcuffed and loaded on a plane to be flown to Egypt where he was tortured.
Said person was in Sweden applying for political asylum.
It caused diplomatic incidents when it was first revealed to the public and Swedish authorities "put a stop to it". Then shortly afterwards, Swedish military intelligence uncovered that it was still ongoing with the knowledge of airport personnel. At least officially without the knowledge of the Swedish government.
Maybe they've stopped now. Or maybe the units that participated in it are just better at hiding it, or maybe the US government is just better at making sure said Swedish government units have better reasons to deny knowledge.
But the fact remains that for sveral years, the US extracted prisoners from and/or transported prisoners through Sweden illegally to hand them over to regimes that would carry out torture in violation of both US and Swedish law and international treaties, with the complicit knowledge of the Swedish government.
It's quite possible the UK did too. But which government do you think the US cares the least about jerking around?