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I think we need to find a balanced approach. There has to be a good compromise.
Those who flatly oppose it, just think about it for a minute. What if your daughter or son was kidnapped and the FBI had the phone, which may contain details on where they are located, but cannot access it. Would you want them to gain access and save your kids?
Of course you would...
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Then you don't let your kids drive a car, or go out late at night, etc. do you. We know there are risks in the world. Those risks do not change when we ask every other person in the world to be at risk for criminals just in case, using your example, someone's daughter is kidnapped.
Do we remove locks on doors just in case someone is trapped in a burning building. Nope, yet hundreds of people have died this way. What if your daughter is locked in a burning building?
Do we remove locks on doors just in case someone is in a car wreck so its easier to open the door to save a life, etc. Nope, but what if your daughter is trapped in the car? Sure, bring on the jaws of life, but that takes longer and there is more chance of injury. Surely, you don't want your daughter to have a higher chance of injury.
These last two example are, of course, stupid examples, but your argument that giving the government access makes it safer is just as bogus. It does not change the risk to, using your example, your daughter one bit. It might make you feel better, but thats it. And it puts millions of us in harms way everyday which, of course, does not seem to matter to you.
What this is, is an other example of government scare tactics in order for people to give up their freedoms and allow the government to track and monitor them. The government does not care if you get hacked. The government does not care that criminals might use your hacked phone to arrange the kidnapping of your daughter. The government cannot even keep its illegal NSA code private.
Do you want the government to do everything necessary to find, in this example, your daughter? Of course, but if they cannot unlock the phone, then maybe they should just do their job in other ways. The likelihood of the phone being the key piece in any investigation with time pressure is small because criminal know phones are not safe already. If there is no time pressure, then there are other ways for the government to do its job. Might take longer, might cost more, might require more skill in investigating, etc. but the risk for the original crime does not change.