Another reality check is that fixing build I broke is typically quick while fixing build broken by somebody else takes a lot of time. Those errors are rarely as exact ad to allow you to fix issue in 5 minutes. Occasionally, stack trace leads to quick null pointer fix, but it is tricky as real cause can be deeper (null should not even happen) and quick fix is just hiding larger problem.

Moreover, having person who made bug is just good practice. Feedback, basically. When people know about own errors and have to fix them, they learn more about errors they make.