I don't think you understand the magnitude of the yearly water vapor number given above. 1 x 10¹⁴ is 100 billion metric tons of H₂O, about six times the amount of CO₂ emitted per year. The important point is that, because water vapor is a much more plentiful component of the atmosphere and also because water vapor does not stay in the atmosphere very long (think precipitation), the seemingly huge amount of human created water vapor is just a drop in the bucket.

As for comparing the water vapor from an industrial cooling tower with the emissions from a home, a single power plant could service a million homes. Estimates for cooling water vapor emissions come in at around 25 gigatons, boosting the human “industrial activity” total to 125 gigatons, still under 1% and still just a drop in the bucket. If you want to find the largest source of water vapor directly attributable to humans I would look to crop irrigation, which uses 70% of the freshwater consumed world wide. Your title, implying that there was something wrong or misleading with my estimation, is either naive or disingenuous.