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Perhaps Your Approval Fills Me with Shame
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Evil Cannot Comprehend Good applies to situations like the racist grandma not being able to understand Bob's motives.
Wrong Assumption would cover the second one, in that Bob seems to be assuming that Alice and he have the same vision of the future in mind. If he's aware that they don't, Bob is instead a Bad Samaritan, supporting Alice's well-intentioned actions in hopes that it will bring about his own vision instead.
Seconding Your Approval Fills Me with Shame for situations where the motives are more morally grey or the actions involve Dirty Business, though.
Edited by Scorpion451
Given the situation for the Trope Namer of Your Approval Fills Me with Shame, I think both examples unambiguously fall into that category.
Edited by BattleMaster
Well, it isn't really a question of approval, since they're not doing it for the reasons given by the other person (and aren't going to reconsider their actions just because of that).
A situation somewhere between Right for the Wrong Reasons, Misaimed Fandom and Your Approval Fills Me with Shame where a character supports another's actions but for completely different (and often evil) reasons. The supported character's success in defending himself depends on whether the author supports those actions or not.
For example:
- Bob joins the military for perfectly respectable reasons (he wants to defend his country, he believes in the military's values, he's a good shot), but his Racist Grandma Alice congratulates Bob for volunteering to kill them dirty foreign [insert racial slur] before they can immigrate here.
- Alice is fighting for women's rights in a society that enforces Stay in the Kitchen. Bob the Blood Knight publicly approves of her actions, because he dreams of a future where Real Women Never Wear Dresses and fight just as well as men, leading to a Proud Warrior Race of constant warfare and Klingon Promotion (a far cry from Alice's vision of peace, equality and tolerance).
Edited by Chabal2