They may well wish to give up their human rights - but why should we give up ours? Because that's what bending or changing the law to accommodate these extreme cases is. As oojimaflip says - it all hangs together, or it is nothing.
I live in London. I was devastated when the tube bombings took place. Each one of those people killed, injured, traumatised, was a unique life. Each person dead was someone who was irreplaceable, cherished, loved by someone. Everything they were and could have been came to a terrible and irremediable end that day. Each lost human life was and is appalling.
And that is why human rights are so important. Intellectually, I can understand what leads to acts of terrorism, I can even achieve some kind of sympathy, sometimes. But I can't accept it. Because its thinking is to reduce the uniqueness of every human life to a mass and to annihilate the living individual.
I see human rights as standing in opposition to that. It must be extended to all, or it loses what it is.
I despise authoritarianism, and the oppressive regimes that also annihilate individuals, in the name of whatever cause. I do see the encroaching on human rights as steps towards the exact kind of thinking that terrorism demonstrates. And that, I think, is why such encroachments must be resisted.
And i say that as someone who is very aware that the term "human rights" is one riddled with holes, with aporia, with terrible contradictions, and is a work that is not yet complete.