[AAAAaccountAAAA]

Because it is not realistic to except a government to always be "good". Courts are just going to rubber-stamp warrants, like they have done with present-day "lawful interception" warrants. And the keys are inevitably going to leak, if they are used routineously to investigate common crime.

[wulfstan]

Apple's iOS firmware encryption key hasn't leaked, as far as I am aware. Do you know otherwise?

There are already very good solutions for ensuring that key leakages are very difficult to do and limited in effect.

[procaryote]

is that very good solution "manage your own keys and don't give a special one to the government"?