Back in the 90's when they reunited Mayhem with the Maniac/Blasphemer-lineup they made a point of not having a problem with Varg, even signing to Misanthropy Records. Hellhammer stated many times he did not care about the death of Euronymous. This was probably also because they wanted to get rid of the impression that Euronymous was Mayhem, even if he sort of was. Remember also that "anti-Varg" was the norm in mid-90's, only later was his reputation somewhat improved again. He started gaining sympathy because it was found that his ideals of cultural revival, traditionalism etc. even while presented in rather outlandish statements sometimes, were more realistic than the "Devil worship", suffering, brain-eating mania of the ultra-satanists. Even Faust who had vowed revenge, stated later that he doesn't have an issue with Varg.