If I had to put words to it, pilot inadequacy is closer to the mark than pilot error.
That's a highly dangerous way of thinking.
The argument that some system or combination of systems failed the pilots ignores the reality that the pilots are part of the system. After all, if the only cause of the crash is that the system(s) failed the pilots then the best answer is to get rid of the pilots entirely. The argument for improved training and systems is premised on the notion that pilots have some purpose on the flight deck. It's irrational to claim that pilots have a purpose and then when then plane crashes shift the blame somewhere else.
Voltaire said that with great power comes great responsibility. This can be condensed to the idea that with power comes responsibility. Since the pilots clearly had some power to prevent this crash they clearly must bear some responsibility for not doing so. It's axiomatic.