There is a question What if interaction wipes out my direct effects in regression?. An answer was given that the true main effects are in the model without the interaction.
I have the opposite situation. Main effects are not significant in step 1. A main effect is significant in step 2 after adding the interaction, but the interaction is not significant. Can I rightfully assume this is not a true main effect?
DV: guilt Step 1: Moral conviction (MC) + Speaking out (SO) Step 2: MC + SO + MCxSO