The RESEARCH, as opposed to gratuitous assumptions, shows that spanking has the same negative effects as beating, and does NOT have positive effects.
See, that's your problem. You present untested RESEARCH as unimpeachable, and sanctimoniously sneer at EMPIRICAL DATA which you demean as "gratuitous assertion."
Furthermore, you know no more about the calibration of this meta-analysis than any of us do, yet your conceit makes you duplicitously dismissive against rational skepticism instead of analytically informative.