If orcs are Always Chaotic Evil (TM), then no. It is word of god.
- Alignment. Orcs are vicious raiders, who believe that the world should be theirs. They also respect strength above all else and believe the strong must bully the weak to ensure that weakness does not spread like a disease. They are usually chaotic evil.
- Alignment. Tieflings might not have an innate tendency toward evil, but many of them end up there. Evil or not, an independent nature inclines many tieflings toward a chaotic alignment.
I'm pretty sure we agree that as far as PC defaults, that there shouldnt be any.