The point is, the government CAN BE evil. By giving them more power than they are allowed to have now (allowing them to take actions that abuse your fundamental rights and freedoms), you open the door for them to grab more power later.
That sorta reminds me of a Star Trek: DS9 episode where some general faked a founder invasion on Earth just so he could turn Earth into a police state, with his troops on every corner. Sure, the planet was safer, but it was a police state and nobody had any freedom.
The reason Canada hasn't been attacked in any serious way is because we generally keep our noses out of other people's business. While America starts wars, Canada is considered to be peacekeepers. We have troops in dozens of countries not to attack them, but to keep the peace.