At the present state of our ability to lift probes to Mars and payloads and costs of the payloads man has no business on Mars or for that matter the Moon.
Our robotic missions can do the job at a fraction of the costs. When it is “very cheap” with future technology a human does have a place on these missions when it is of much lower cost. Humans do not have a place on these missions today due to costs.
We will walk on Mars one day. It will not be with current technology.
To lift a human payload to Mars the vast majority of the payload will be to just to keep the human or humans alive. It would be an aberration of rational science with our current technology. This will probably change in the future but it is not today.
Oddly with our current technology we could put a man on Mars at incredible costs and little science would be gained much like our missions to the moon. Our missions to the Moon were an incredible feat. All the science of those missions could have been done at fraction of the cost compared to robotic missions.
Putting a man on the Moon was political and not scientific.
Perhaps. But robots are not capable of improvising their strategy to handle new discoveries that occur on the spot. They are limited to their original programming. But putting people on Mars will be nothing like the moon. A launch window for Mars using a Hohmann transfer only occurs about every 2 years. It takes about six months just to make the trip. So a manned mission will have to spend six months in space, a year on Mars, and another six months in space to get back. Not like the 5 day trip to the moon. With nuclear engines we wouldn’t need to bother with a Hohmann transfer, so maybe it’s better to wait.