Open source software is (I would argue) even more driven to fragmentation by political, ideological, and personality conflict driven squabbles than proprietary software, as there is no profit motive to also satisfy.

Also, the broken window thing asserts that small amounts of criminal activity lead to larger amounts of criminal activity via signaling that being bad or neglectful is OK, which is both not proven and irrelevant to software writers being prone to reinvent the wheel for whatever reasons they have.