The stories about rav aharon in mishnas reb aharon were told by talmidim and nobody came out and said there were glaring mistakes, and it was published when a LOT of original talmidim, like rav chaim Epstein, rav Meir Hershkowitz, rav laiby dicker, etc….were still active.
I doubt the askanim who arranged the satmar rov’s ticket were aware of what kastner had done to procure that train. The truth only came out later; if they did know, the satmar rov would have exposed it to save yidden.
“You can argue that the deal would have been made anyway so there was no issue with them buying their way in. That is no different than saying the knesset and the state of Israel will be there anyway. Let us do what we can to work with them for the sake of Torah”
If the interaction would be one-off then yes, but we’re talking about being entrenched in it consistently. Big difference.