I singled out the original BSD license because it was extant and the GPL was not compatible with it. Such clauses are pretty common in the software world and give credit where credit's due; hell, Microsoft has no problem with it, why does it bind the panties of the average GPL supporter so much?

Furthermore, I'd argue that a lot of those defense mechanisms that copyleft supporters claim are necessary cause much more harm to Free Software than they do to proprietary software. The ability to use GCC for static analysis, for example, was muddied for many years by the GCC team's unwillingness to create a suitable API out of fear that it would become easier for proprietary software teams to use GCC without contributing. Meanwhile, proprietary compiler chains, like those Microsoft provided, were easily able to create those same tools because they were not driven by such fears. Additionally, you have statements from people like RMS trying to memory hole software ( http://gcc.gnu.org/ml/gcc/2001-02/msg00895.html ) that doesn't agree with his political views. While the goals may be noble, the route the free software community has chosen to get there has devolved into stubbornness and childishness to the detriment of everyone.