Because the title implies that Google does not think that G+ is something users would want. There are people who genuinely like G+ and maybe even think it's awe

Because the title implies that Google does not think that G+ is something users would want. There are people who genuinely like G+ and maybe even think it's awesome that YouTube now is so tightly integrated with it. So a title implying that Google did G+ because they wanted to exploit ad dollars from users without caring about the users themselves, IS a "did you stop hitting your wife"-like question.