Because the likelihood that I get a PDF designed to exploit a bug in XPDF (or other image viewer) after being converted to PS and back by Ghostscript is relativ

Because the likelihood that I get a PDF designed to exploit a bug in XPDF (or other image viewer) after being converted to PS and back by Ghostscript is relatively low (e.g. this would seem to indicate that I'm being targetted personally, or I have a common setup)? But, in general, I'm not saying "use ghostscript", I'm saying "perhaps roundtripping incoming PDFs through some other file format will produce a PDF that is safer to view than viewing untrusted PDFs directly"