Your headline shows you do not understand British law.
Your sneer about "nancy boys" only reinforces your ignorance.
We do not merely throw people in prison gratuitously.
Nor do we arrest anyone gratuitously.
Arrest follows suspicion of having committed a crime, being caught committing an offence, or acting in a manner suggesting criminal intent.
The suspect is either charged or exonerated depending on the results of interviews by the Police, but may be released on bail.
Between charge and trial the suspect is still innocent but remanded in custody or released on supervised bail, as the Court deems; depending on assessing his or her danger and the seriousness of the charge.
Any sentence is passed only after proof of guilt, by admission or trial.
Nor does the prosecution or complainant call the sentence. The trial judge determines that, helped by legal guidelines and background reports.
This is Great Britain, not the Russian Federation.
Those men caught near RAF Fairford were reported to the Police by a farmer. I think he more likely suspected intended crimes against farms, not the base. The Police did exactly what they are supposed to do by Law.
If the USA feels she can no longer trust Britain, or opposes our basic judicial principles of no un-tried imprisonment and the prosecution having to prove guilt, that is unfortunate but entirely its own choice.
Yet can any foreign power now trust the USA's present leadership, in return?
Were the bombers on UK territory for flying reasons and NATO agreement; or so any attempted attack on them would be both outside of the USA, and Trumpian propaganda against the unfortunate host?
[That has a precedent. At the height of the Cold War, the USA placed many of its nuclear weapons-carriers in Turkey, Britain and other countries, without needing the hosts' permission to launch them; presumably in the forlorn hope of drawing USSR fire from the American continent.]
Where did the bombers go anyway? Back home or to some other overseas base?
Incidetnally, you Americans can no longer rely on your geographical isolation as defence against hostile-state attacks by arson, sabotage, individual murders and on-line interference. Some of your - and my - enemies are learning to groom local low-lifes like drug-dealers into becoming unwitting, disposable proxies. It's easier and safer for the attacking country than sending their own agents.
