Can we first claim and then find the evidence when we write the literature review (i.e., using confirmatory technique)?
Claim -> evidence is a perfectly valid approach. It is just that evidence is not the same as only looking for supporting information, it means critically scrutinizing all aspects that speaks for or against the claim and then drawing an educated conclusion on whether the claim is good or not. In the end the "evidence" is the net outcome of positive and negative support to the claim. So to me the claim that one should come up for an idea an then look for support is either poorly phrased, leading to misunderstanding, or plainly bad.