So, you are suggesting that if hundreds of physicists do various experiments on some property of gravity, say, the speed of propagation of gravity, starting with Urbain Le Verrier in 1859, and they publish these experiments, and their results, in peer reviewed journals, and over 150 years of extremely competent physicists, each trying to make their reputation by trying to disprove the commonly held theory (that it occurs at the speed of light), none of them come up with any answer other than, gravity propagates at the speed of light - that you don't believe we should, as a society, and individuals, subscribe to this notion, because all of these experts have found it to be true and told us it is the case?

After all, there is no way for you or I to determine the speed of propagation of gravity, so what choice do we have other than to rely on other's authority?