There's no excuses for incompetency and irresponsibility.
Yes there is.
The law of averages + Pareto principle guarantee that not only do we have a very very small number of extremely competent people doing the majority of the work, the rest of the workload is spread among (at best) people with average to below average to slightly above average competence levels.
The world is messy, there is no possibility of ever achieving anything remotely comparable to competence or responsibility, without great cost.
The universe seems to prefer good enough to better on average.