Re: Downvote bait.
Better arguments? I've got them.
>what can a human do that machines cannot do (and very much better).
1. Control the machines. It takes several minutes (10 - 30) to send a signal there from Earth, which is too late for most sorts of even minor emergency, and our robots are only good at
turtle slug speeds of 1 meter per hour and with all 6 wheels firmly on the ground. Which brings us to...
2. Scale the terrain. There's probably no other mechanism on Earth, hand-made or biological, that can climb from hundreds of meters below water to the summit of Everest, with very little equipment. Machines won't be there for decades.
3. Improvise. When tackling the Unknown, a machine can be designed for many contingencies, but a small stone lodged here, or a wire torn there, or a drop of oil clogging that - and it's disabled. A human on site can fix in minutes or hours, what ground crew at NASA will take 5 years (and a new mission) to handle.
In short, with currently available technology, a permanent base on Mars can perhaps be developed, if humans are on site, but probably not otherwise. Sure, we can land some ready-made habitats there, but nothing more permanent or safe. It would be tin cans all over again.
P.S. perhaps with an advent of 3d-printing, a proper concrete base could be created on Mars by machines... but it's still more fiction than science at this point.