If we don’t bug a conversation between Khan and Ahmed, who do we bug?

Should members of Britain’s beleaguered and persecuted bombing community be subjected to intrusive surveillance techniques such as bugging? It seems a bit illiberal, given their very real difficulties in day-to-day life. Hard enough trying to find a safe place to hide all that fertiliser, castor beans, etc., without having to worry if your whispered conversations after Friday prayers are being eavesdropped upon by some spook.