So I'm definitely not advocating the lab theory overall, and even if it did come from a lab it could have escaped rather than been deliberately released...but to answer your question, China does/did have problems with A) an aging population, B) a male heavy population, and C) Hong Kong streets full of protesters. This virus "helps" with all of those.
Bioweapons are crappy precisely because of what's happening now. A good weapon discriminates, and lets you kill exactly who you want. By that measure, a virus is about as hamfisted as you can get. Besides, why unleash a pandemic on the whole world when you can just do what China normally does and use conventional military power instead? It's cheaper and easier to get some men in boots with guns to stop a protest than it is to unleash a worldwide pandemic that might last for years or longer.
