Huh

To justify pointless laws.

He also made the tree of life that Adam and Eve were never supposed to eat from. Just because God made it doesn't mean that we should indulge in it.

I personally hate weeds, and the fact that they are capable of growing and spreading thorns and goat-heads around so quickly. And I will forevermore continue to abhor them, unless God Himself gave me some reason to not hate them. Now, on the off-chance that you were talking about the definition of the word 'weed' that is used as a drug, I've heard that is has medicinal used, so I'll give it that.

Because it's illegal

I don't know, but there are those who call it "the devil's lettuce". So they're probably confused on who made it.