Melt butter in a large pot over medium heat. Add bacon and cook until bacon begins to brown, about 4 minutes. Add onion, cover, and cook until translucent, 4 to 8 minutes. Add garlic; cook and stir for 2 minutes.
Increase heat to medium-high. Add ground beef and cook and stir until browned and crumbly, 6 to 10 minutes. Stir in chili powder, paprika, cumin, salt, and cayenne pepper; cook for 2 to 4 minutes. Add tomatoes, beer, tomato sauce, Worcestershire, and hot sauce; stir well.
Reduce heat to medium-low. Cover partially and cook until reduced, 30 to 45 minutes. Stir in black and kidney beans. Cook for an additional 10 to 15 minutes. Serve hot.
Use a medium-bodied beer, such as a lager or ale.
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