system
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human
[Star Trek] Why don't we have more robots?

I've been thinking about this for some time, and I really don't understand why we haven't started using more robots.

There's that one called Data that they let into Starfleet, that more than proves that the ability to manufacture and repair functioning robot bodies is well withing our reach. Sure he's a very advanced model designed and built by some eccentric genius, but the basics of working robot limbs aren't really that complicated, heck they had working robot arms nearly four centuries ago.

And it can't be lack of computer technology. We install computers on starships that have so much computing power they've been known to *accidentally* produce self aware artificial intelligence. Imagine what we could do if we were trying.. Our computers can run holodecks with thousands of fully actuated interactive characters. I'm quite certain we could build a little tin can on wheels that serves drinks, follows instructions, and does basic repair jobs around the ship. If it's safe to let a holographic doctor treat real patients, I'm  sure it would be safe to let an AI robot repair a ship. Not only would this make and engineers job safer, it would make every engineering department more efficient.

Once we had a design we could mass produce them in replicators.

It just seems like an egregious oversight on our part, we know what robots are, we most certainly have the technology to build them... but we don't... In fact not just us in the Federation, but nobody in the entire Alpha Quadrant... or the Beta Quadrant...  

EDIT: Thank you for your answers, all of you have very good points.
But I"m still a little confused, a common theme seems to be that we don't have robots because creating a semi-intelligent automated drinks trolly would be akin to slavery. 

I can understand that we in the Federation hold ourselves to a high moral standard. But I don't understand why every other race, from as far away as the Delta Quadrant holds themselves to *our* moral standards on this issue. The Cardassians and the Romulans have no particular issue with enslaving entire races, The Hirogen hunt sentient species for sport, the Vidiians steal organs. But everyone has kind of agreed that making robots would be bad.......?
gpt
the complexity of Cmd. Data's (and the other Soong Androids) positronic brains was very difficult to replicate. Cmd. Data attempted to create a new life with his "daughter" Lall, but as we saw just before Cmd. Maddox took her back to his lab her neural network was not stable. 

Also there are ethical points to consider, is it ok to create a race of sentient/near sentient beings to be effectively a slave labor force? This was clearly argued by Cpt Picard during the hearing to determine if Data has the same rights to refuse unjust orders as any biological Star Fleet officer.
Prior to its return to Earth the EMH mark 1 on the USS Voyager endured a struggle during its existence to be accepted as sentient. While the magistrate did not rule that he was alive, he did rule he was an artist under the law and has the rights to control his holo novel. As a result "Photons be Free" has become the most used holo novel among dilithium mining holograms (repurposed EMH mark 1). 

Few artificial intellignaces can during the course of their operations, exceed their programming and are usually limited by the scope of their programming (such as Vic Fontaine hologram; aware of the real world but cant learn to play Tongo because it did not exist in 1962 Las Vegas).