Many, many single-purpose rovers can be sent in the place of a human mission with no risk to human life. There is no scientific justification for sending humans on a science mission, it's mostly just adventurism.
What also gets to me is that clearly people have done this cost-benefit analysis before - people that know a lot more about the topic than me. It lacks humility to ignore their reasoning (see https://spacenews.com/independent-report-concludes-2033-huma...).