I hear little green men live under the hood of your car.
There are thousands of strains of flu virus. Early in the year they do a calculated guess as to which three will be the "Big Three" that year and they make a vaccine.
If they guess correctly and you get vaccinated you will not get the prevailing strains of the flu. If they guess incorrectly you might get the prevailing strains of the flu however chances are the strains they chose are close enough that you will suffer much less then you would without having gotten the vaccination.
As for "people getting sick" because of the flu shot, yes they can if they are allergic to the shot. If they have a very weak immune system and they get a live virus immunization they might get the flu. Because the virus was weakened they will get a much lighter case.
I am not sure it is the medical professionals who have no brains but do as you like.
Just FYI the live-virus comment: The person who gave me mey shot made a point of informing me that my flu shot contained no live virus.
I think people need to be sure to read the form they fill out prior to receiving the shot and to give thoughtful, correct information. I have never, ever (with 100% certainty) had a problem with flu shots.