Germany

Money. If you smoke weed you'll be less likely to drink copious amounts of beer. At least that's what I do when I want to save on overpriced drinks. Why should I drink 3 beer steins when 1 puff of weed makes be just as buzzed with no hangover?

That's the point. People buy less beer when they're high. That mean less money. Bavaria has many breweries and they're all lobbying against another legal drug other than alcohol because they fear that sales will go down. Sales will go down though, and that's a good thing because alcohol actually makes people sick and even kills people

Well for one, the governing party in bavaria (CSU) is heavily against cannabis so that might play its part. But also, if you’re happily blazed you won’t buy the absurdly expensive beer at the Oktoberfest. If you aren’t high they can sell you beer for 15€/litre so you can get drunk instead and make them lots of profit.

Not surprising at all. It is Bavaria -the land of the lederhosen- we re talking about, also referred to as the "Texas of Germany". They have their heads so far up their asses that they consider alcohol to be a harmless staple food and at the same time think that cannabis is a drug as dangerous as heroin and crack. Many of those clowns even believe cannabis is administered by injection, lol.

The motivation is to stoke fears in people that are against cannabis. For the conservatives like CDU and CSU party every change is bad. They even promised to illegalize weed once they are ruling again

Alcohol lobbyism.