I want to know the answer to the following question:
What do death penalty opponents argue that capital punishment isn't effective at doing?
All the background I'm provided with is that "Furthermore, some opponents argue that the arbitrariness with which it is administered and the systemic influence of racial, socio-economic, geographic, and gender bias on determinations of desert make the current practice of capital punishment immoral and illegitimate.". Is that enough to answer the question?
Answer: no