The Security front liberty

When we can say security is more important than liberty? I think it's very subjective this theme that's why I'm going to talk about it. In my case I prefer security than privacity because we are weak against an attack of terrorists. In my opinion the measures of France are totally understandable becaues our liberty is a small price for be safe. In a strict way we are winning liberty becaues we are not arrested to the fear of be attacked. Some civils are manifesting their opinion and they say that's a crime but for example the match of Barça vs Real Madrid, a lot of policemans were around the stadium for protect the civils because if we are frightened to an attack they win.