I also had this suspicion for some time. In reality they have a large amount of premises in their economic models which must be true in order for the conclusion

I also had this suspicion for some time. In reality they have a large amount of premises in their economic models which must be true in order for the conclusion to follow. Also there is e.g. a large amount of empiric data supporting minimum-wage laws are beneficial and also a large ammount of empiric data showing it's harmful! Conslusion: there are no solutions only tradeoffs.