Lottery tickets are almost always negative expected value which means you're basically lighting money on fire, and governments worldwide love them. More generally the US government acts as an oligarchy. Government self interest, followed by special interests are what generally drive government action. Public utility (and opinion) play a very minor role. And yes, I even have a source for this as well as I understand this is not what many people want to believe. [3]
[1] - https://www.fool.com/investing/2016/09/25/how-much-does-the-...
[2] - http://news.gallup.com/poll/193874/half-americans-play-state...
[3] - http://www.princeton.edu/~mgilens/Gilens%20homepage%20materi...