Bad example .... they invested billions of dollars worth of tech to get this employee back on the job
In real life ... they make no investment in their employees, yet they expect them to work at full efficiency even if they are missing a limb or an organ
I think OCP was trying to win private policing contracts in other cities. If they could offer robocops, a LEO who produced measurable better results over traditional police departments they could get more contracts.
So it wasn't really an investment in a worker it was a tech demonstration.
Wasn’t the point that the actual robots produced by the corp that made him were unwanted and mistrusted by the public, so they took an almost dead cop and rebuilt him as a human looking robot to popularize the tech?
They didn’t invest in him they just bought a corpse for marketing purposes and made it a robot with a face.
The whole film was dripping-wet with satire, pointing out flaws in the society of the US and Detroit in particular (at the time). OP's remark is just one of many such beats in the film. We're supposed to be both entertained but also moved to do something about how f--ed the situation outside the theatre has become.
The 2014 remake made sense to me... it was a remake by Omnicorp. They evil corporations won, then they remade Robocop as a 'no blood' 12a. It was a super-dark play on the fact that they couldn't make the original anymore. [edit: added date & link to imdb]