Incompatibility is one thing. Overwriting icon files with nothing is another. Yeah check the requirements, whatever. Are you going to sit there and tell me you have never installed something that was designed for anther OS just to see if it will run (because 50% of the time it does)? And yes, 4.2 does run, and yes, occasionally you find that piece of software that will not and even then you may have to boot into safe mode to get rid of it. But once it's gone everything works just fine! However, this is the first program I have EVER run into that has incompatibility issues that completely destroys part of the system cache.
THERE NEEDS TO BE A WARNING SO PEOPLE UNDERSTAND WHAT MIGHT HAPPEN DUE TO INCOMPATIBILITY!
Wouldn't you be a little upset if you installed something that bricked your system with option for recovery and the company never told you it might happen if your system is incompatible? Most respectable software will stop you before you completely install it if it knows it isn't designed for the environment you are about to install it on.
Telling someone they are an idiot because they didn't read the requirements and that means they are just S.O.L. is about the biggest kick in the teeth I have ever seen. If you don't know how to fix it, then keep your unproductive opinions to yourself. Grow up.