C'mon, you know this is different. Whitebeard was at the end of his life and Journey as a Pirate, and Ace was at the beginning of his. There was still a chance to save Ace, but Oden was already long dead by the time the Whitebeard Pirates found out. There was no need to spill unnecessary blood on a quest for revenge. We already knew this was Whitebeards mentality, as he had told Ace time and time again to let it go when it came to Blackbeard killing Teach. It 100 percent fits Whitebeard's narrative.
The Whitebeard Pirates risking their lives to save Ace who still has a chance at life, is not the same as throwing countless lives away on quest for revenge, which would ultimately lead to absolutely nothing gained in the end.
Ok, I'll give you the argument that the circumstances were different.
Yet this whole Oden-WB situation still doesn't make much sense, if we don't want to use extreme excuse-mode.
Why on earth didn't he bother looking for him, after Oden had returned to Wano?
They were literally like brothers and both Oden and WB even said that they would unite again asap after his voyage with Roger ends.
Yet somehow WB didn't care one bit about Oden anymore ... for like 10 years or so!
I also refuse to believe that WB would just let the wife and children of his "brother" rot in hell like that. Like come one, even if he doesn't want to start a war, he could've done
something (trying to sneak them out of the country etc.).
No, I stand by my point here: Oda wrote himself into a corner with this Oden-WB connection and now tries to fix things up with bandaid. It works at least somehow, but if you take a closer look, it's not pretty/elegant (writing).