In most of the cases we've seen with extraditions to the US for hacking, the burden placed on the US to justify the extradition has been pretty significant. We have in fact lost extradition cases where few of the underlying facts were in doubt.
I'm also not sure how bringing suspects to trial in the US flies in the face of US justice system ideals.
Well in this instance I'm suggesting that the uprooting and deprivation of freedom using foreign law as a basis is unreasonable. I fully admit this is a lay person interpretation and the law likely disagrees, but I would imagine that a more fair process would first let an international court or the local governing body determine in full if they cooperate, not instead have a blanket extradition treaty. Unless I am misunderstanding the entirety of extradition treaties, it just seems the burden of proof that they have the right person to even start questioning is low and not subject to scrutiny except from within.
The exception being the European arrest warrant. Assange was going to be extradited from the UK to Sweden for something that is not a crime in the UK. (Failure to use a condom is considered extremely rude but is not a crime in the UK.)
I'm also not sure how bringing suspects to trial in the US flies in the face of US justice system ideals.