If we are searching for something that does cannot be evidenced to exist, then it is not possible to say that x.....y are not true.

If I pull a concept out of my ass and say that nothing is this x, it is different thing to say as we should that the whole concept does not exist rather than trying to catch that false question setting like dogs. Because of course saying that nothing is x is not innocent but a way of doing something, implying obligation etc. For example the justification of capitalism is that no morals can be measured so we should welcome laissez faire.