Backdooring stupid.crypt and forcing law abiding people to use it just insures that big badguys will use any other kind of encryption. All you've really accomplished is adding an extra charge of illegal encryption use at the expense of security for every human.
This potentially creates all sorts of pathologies. Is it illegal now for me not to update an old computer? If your backdoors are implemented in hardware, is it illegal to use old computers?
When people are against gun control, a common thread is "make guns illegal and only criminals will have guns." This argument has merit, but if we DID amend out #2 and make guns illegal, over time firearm proliferation would decrease.
Not so with encryption. Other, more free countries will constantly be developing better security methodologies, and reproducing those methods is effectively free. "Fuck up encryption, then only bad guys will have encryption" is a much stronger argument, because it's emphatically true.
The ignorant hubris of this is massively disheartening.