in a word control.

its not mainly the goverments themselves, its the politicians that are pushing it. If enough of the ones wanting to pass legislature to gain controls of industies get elected, a lot of out "luxeries" will become a thing of the past. When its the people that are in control of the goverment that are pushing it, then they will continue to gain more control. Also every one of the studies cost money. these require that the tax man get more money from the people for these studies rather than other things that other politicians want.

the more man learns, the more he realises, he really does not know anything.