As someone that has been part of the computer forensic community for more than 10 years, advised Apple and numerous Fortune 500s in addition to governments around the world, I can tell you that you're completely wrong. There are certainly solutions to work with phones after the iPhone 4.
You weren't even aware that the iPhone 4 and earlier could be easily accessed until this case broke. You're equally clueless to the abilities to perform forensic investigation on current models.
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FBI has had this tech for years. They attend forensic conferences frequently and work with many of these vendors to supply them with the tools they need to go after criminals.
Back in 2007 I sold them a device that pulls passwords, emails, chat, web browsing history, contacts, wifi networks connected to, and countless other items from any Mac, Windows, or Linux machine. Wired did an article on it back then and was PISSED that we wouldn't give them a copy of the hardware to try themselves (we only sell to licensed law enforcement). That tech has been around for years and 99.99% are blissfully unaware that the government has the ability to do that.
It's funny to see so many get up in arms when they realize this tech exists, even though it has for years and they've simply been unaware.
If they want to be mad at someone, they should be mad at Apple. Back in 2008, we met with their head of iOS security and demo'd the product. We showed them how we could pull all types of information from the iPhone. He simply dismissed it. So rather than working with their blessing, we worked with their government sales guys to sell it to countless government agencies. They turned down that opportunity but they've also done nothing to patch the way we exploit the OS. Our profit.