Earlier quoted context omitted.
Doctors have to go to medical school and then have a residency and the AMA closely controls the total supply of physicians. Lawyers have to go to an accredited school and then pass the bar (in some states the school part is optional). A computer science degree is the closest thing the tribe of programmers has to a professional certification. There are some organizations that have attempted to bring the tribe together…
Those licenses are not to protect the Doctors/Lawyers, they are to protect their clients. Having such a system for programmers would make no since and would make the situation much worse. A college degree means a lot but you can be a very good/success programmer without one. I would NEVER go to a doctor/lawyer who did not have the correct credentials to practice. As such you "practice" medicine and you "practice" law…
It goes both ways, like an if-by-whiskey.
If by licenses you mean those draconic practices by which some exclusive guild is allowed to tell me which professions I am allowed to practice in order to keep their supply low and their prices high, then I am against them.
However, if by licenses you mean the protective mechanism by which government prevents uneducated hacks from performing open heart surgery on citizens, then I am for them.