I didn't say Beerus considered Frieza a threat to himself. I was replying to Raiga's comment, specifically the "but because Toryiama genuinely thinks that more Frieza is what people want to see" part. The Z fighters are the main characters, so since Beerus mentioned Frieza, there's a justified reason for him becoming the focused villain again. Sure enough, he gets revived, trains for a few months, and is able to evolve to a new form and actually manage to blow up Earth... Even if it gets Superman 1'd like a minute later.