[kawa]

Politics works on a combination of public opinion and donations to candidates and parties. If you have a lot of money, it's quite easy to move things a bit in the direction you want. Also here, you're doing it for a "good cause", because we all know that drugs are bad and everybody should think of the children, etc...

So of course many people don't suspect bad intentions here, maybe even many politicians or organizations which are on the receiving end of a donation, which originated from drug money.

Of course there are some other reasons too, but considering the amount of stupidity which is necessary to really believe that the "war on drugs" can be won, it's quite unlikely that there isn't lots of active lobbying involved to let the war continue as long as possible.

In the end, it's just a very profitable business and the people involved aren't stupid and have lots of money at their disposal. So why shouldn't they do it?