The group were convicted of discussing the idea of driving a bomb under the base's gate attached to a remote controlled car [1]. They didn't actually do it. They also discussed obtaining weapons, but didn't do that either. They did arrange to attend terrorist training camps in Pakistan, but its not clear from the news reports whether they actually travelled there.
EDIT: According to [2] one of the group did go abroad for training.
[1] http://www.bbc.co.uk/news/uk-22178105
[2] http://www.theguardian.com/uk/2013/apr/18/four-jailed-toy-ca...
If the discussion alone is the damning part, with disregard to the intent... coupled with some prejudice, and add irrational fear.
Self censorship is what you get.
Sorry this guy is a criminal and a murderer, his value to society is pretty low to considering he hasn't done anything of a value in his life, except moving to UK.
I do agree that "considering attacking" does sound slightly weasely and like a thought-crime; hopefully they were seriously considering it.
If people would just quit being afraid of this stuff, by definition, 'terror' wouldn't be created, would it?
Telling people the rapture will happen at 2:30pm tomorrow would in fact create terror in the minds/hearts of certain people. Are you a terrorist if you tell people that Jesus is coming back tomorrow afternoon?
The subtle difference is between using terror to reach a goal and using some action to reach a goal with a side effect that people experience terror. For example:
A group of hackers could hack into the bank accounts of the 1% to distribute their wealth among the other 99%. They don't have any intention to create terror and probably think that the 1% can easily take. Of course, the 1% will see it as an act of terror. And probably journalists, lobbyists, politicians will spin it and use it to create terror among the larger populace.
Another group of hackers is hacking into facebook accounts to make people's secrets public to try to get the public to care about privacy and not to put their trust blindly into social media. In this case, they would use terror consciously as a means to this end.
Seems to me like these guys were talking about guerrilla tactics against a military target. I don't think that's necessarily terrorism.
EDIT: Though as the defence counsel for one of the four pointed out, they remained free for another 7 months after the alleged plans, so it's questionable how likely they were to have been carried out.
The article might make it appear they jokingly talked/thought about a bomb, but others make it clear there plans were concrete. It mentions them going to "meet the brothers" at a training camp where duties would include "helping them making the bombs". I think it becomes a crime when it goes from curious learning to definitive plans. They weren't just thinking something socially unacceptable, they were planning to cause harm.
It sounds like they only charged him for this after he gave up the keys he was previously withholding. While I disagree with the power this law gives, its less extreme if its only used when they can prove the password was both covering up a crime and not forgotten. More of a deterrent, and slightly less of a thoughtcrime.
Conspiracy is a crime, though. A guy can be charged for saying something like, "Let's plan out how we're going to kill my wife. You go buy a gun..." The police don't have to wait until the guy actually kills his wife before arresting him.