Come on IBN, you've complained (in a roundabout way) in at least 2 threads now in Meeting Spot about Karma. There is a thread in Site Comments all about it post there. Everyone already knows you are against it, ignore it or PM Julio, but don't keep littering threads about it.
Now with that out of the way - The fish thing even if it were true, it comes at a price, there would be incredible water pollution from live fish waste, and you have to feed the fish, they don't just grow by drinking water. All of that food then has to come from animal byproducts and/or crops, the efficiency rate of converting fish food into fish mass for people to eat is pretty low, might as well feed the humans the crops and animal byproducts.
As for the drug dealers, I imagine they get punished pretty hard with the thought that if you remove the dealer you may remove some users. The problem with drug users is once you become addicted to meth, heroin, coke you run a high risk of becoming a screwup in society - losing your job may be a start, which then you aren't paying taxes, and have no legitimate source of income. Then how do you pay for the drugs, crime. It may be false logic to think removing the dealer eliminates the users, but thats how the lawmakers see it. There is also a lot of law breaking going on to get the drugs to the dealer.