On the other hand, the UK as well as the Netherlands, have been harboring suspected terrorists for decades.
What about the other side of the coin?
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In general equating ultra radical organizations like this one with mainstream US fundy Christian ones like Focus on the Family seems deeply misguided to me. The American mainstream fundies bear a lot more resemblance to moderate Islamists like Qardawi or Sistani than they do to the friendly totalitarians of Hizb al Tahrir. By that I mean that they believe in democracy but one where the 'true' religion plays a major role, particularly in legal norms regarding personal life and morality. Something rather different from the outright rejection of Democracy as an inherently evil ideology because it gives sovreignty to the people rather than to god, or rather his representatives on earth.
Joke Kranenburg is understandably angry that RAF terrorist Folkerts is walking free, her husband shot to death at the time his son was 22 months old and Joke was pregnant of a second child. Dutch Justice did not follow through on the conviction in Germany, nor were they informed when Folkerts was released in 1995.
Knut Folkerts belonged to the second generation of the RAF. In the fall of 1977, he was responsible for a new wave of terror violence in Germany. The three persons in high position were murdered in execution style atacks.
The Dutch authorities had expected the RAF terrorist would receive a life sentence for his deeds and stay imprisoned. Reality is often seen to be played by its own rules, justice not well served.