Well these are just my opinions. i am in no way saying these are the exact reasons the government has made marijuana illegal and probly has no plans on legalizing it.
1.
No tax money - This being because its so f-ing easy to grow(in my opinion) that anyone could grow it and not pay a cent to the government. Take for instance Tobbacco, as much as people want it illegal the government wont do shit about it, why, because they make so much f-ing tax money off it. Think about it man, if there were a thousand people growning Garden sized weed patches how much tax money would that be from the gov? A f-ing lot. i mean look at how much it goes for on the street? people would still be selling it for the prices they are now , really robbing the people buying it, because the people buying it could grow easily a pound per bush. i know this really isnt a well thought or for that matter well put together thesis (nice word just learned haha) so im going to leave it at that
thank you and goodnight