1. The warning you referenced clearly refers to the potential dangers of the PNG being an executable in disguise.
2. BLAG gave a clear reason as to why SELinux is not enabled by default- it does not work with certain legacy applications. 3. If SELinux was actual malware then a) BLAG would not have been the first to discover it, b) there would be massive uproar all over the GNU/Linux community, and c) it would be nowhere near the BLAG system. Oh wait- it's the 'NSA is everywhere' guy.
