Why do they want this ? (Score 1)

If I was part of the security services/police I would NOT be asking for mass surveillance. The hard part is anaylysis of the data, which will inevitably become backlogged, so when a terrorist event happens it will turn out that the security serivces had all the information which - when published after the event - will make them look stupid because it will demonstrate that they had all the information needed to prevent the event.