There's overwhelming evidence against such a broad statement.
There are good mechanics, cars are getting safer, cops do fight crime, soldiers do fight wars and so on, social workers so do their jobs, teachers usually teach and so on.
You can say the same for every kind of work -- that you are incentivized to do a poor work so that there's more demand for the work, but the counter incentive is the free market.
If others can do a better job than you and eat your lunch, they will.
There are good mechanics, cars are getting safer, cops do fight crime, soldiers do fight wars and so on, social workers so do their jobs, teachers usually teach and so on.
You can say the same for every kind of work -- that you are incentivized to do a poor work so that there's more demand for the work, but the counter incentive is the free market.
If others can do a better job than you and eat your lunch, they will.