http://gallium.inria.fr/blog/intel-skylake-bug/
"More experienced programmers know very well that the bug is generally in their code: occasionally in third-party libraries; very rarely in system libraries; exceedingly rarely in the compiler; and never in the processor."
If it causes an issue with our own systems it also gives me a very good justification for doing it.
And then many other times I honestly don't have the knowledge to be able to contribute into large third party systems and it seems very rare to get an issue resolved without submitting a pr.
And lastly sometimes it's hard to judge if unexpected behavior is really a 'bug'. Similar to the last point, it can honestly be hard to tell the difference sometimes.