You can't blame Google and nor "their" OEMs. You can blame specific OEMs(Nokia in this case) for improper heat dispersion in the phone.
I repeat again, you can't blame Google and their OEMs for a warped Lumia 930. You could however blame either Snapdragon or Nokia.
I don't think I got my point across clearly.
1. Google created an heavy operating system that needed more horsepower to run properly.
2. Samsung & CO. picked that up and turned it into a differentiation strategy, aka "the spec race"
3. Heavy operating system -> more computing power -> more heat -> melting plastic
4. Big screens = more heat = melting plastic
A more optimized operating system, and a more efficient way of using available computing power would prevent unfortunate events such as the one discussed in this very thread.
The current generation of smartphones are generally overpowered and inefficient. Non of the software (expect maybe heavy 3D games) can take full advantage of the available computing power.
The Android(Linux), iOS (Unix), and WP (Windows NT) kernels are all from the desktop/server era... obviously they were made for machines that are always plugged into the power grid, not devices with limited resources powered by a battery.
They've done an amazing job to make them work, and they do, but the old design still lingers around..