If you want to give powers to the police, security agencies and military, and you want the public to demand you do it, then ensure there is more crime, violence and terrorism, and then it's a cinch to achieve your aims. Once the people are afraid of being robbed, bombed, or shot, they will demand you take their freedom away to protect them from what they've been manipulated to fear. Recent mass shootings are an example of this kind..
I call this technique "Problem-Reaction-Solution"
Create the problem, encourage the reaction; "something must be done", and then offer the solution.
It is summed up by the Freemason motto 'Ordo An Chao", (Order Out of Chaos). They create the chaos and then offer the way to restore order. THEIR ORDER. The masses are herded and directed by many and various forms of emotional and mental control.
It is the only way it could be done, the New World Order.