Earlier quoted context omitted.
The Chinese were targeting specific journalists and critics. Presumably to harass them. I'm not saying the US doesn't do that, but the evidence is not as clear.
Maybe you didn't notice the detainment of Greenwald's partner by the GCHQ whereby they demanded him to turn-over/destroy whatever he had. Further, the break-in to Greenwald's residence and theft of his machine. As well as the visit to the Guardian and destrution of machines.... The evidence is crystal.
Miranda's detainment, confiscation of the memory sticks etc was to be expected - as far as the UK Government is concerned he's carry stolen state secrets.
What I don't really understand is why he flew through London carrying them, I believe Madrid has more routes to South American - I wonder if he was routed so he would be picked up for massive publicity.