Frank your Majesty said:

Wishing for things to be different is not wishing for things to change it's wishing that things in the past played out differently. And there is no way to put such a wish into practice.

That is just putting the change at a different point of time scale. It is still wishing for a change.

Unless you wish for something to have happened differently in the past and assuming that it cannot be changed in the present/future then of course it cannot be changed. However this was not the case in the current argument as Ender was clearly talking about present.

Frank your Majesty said:

Also, there is an alternative to brainwashing: simply talking to people and trying to convince them.

Well that is brainwashing. Especially if you do it on kids. Put kids into creationist school and you can be sure they will convince them simply by talking. Of course I am fair enough to admit that from their perspective our normal schools are brainwashing too.

Frank your Majesty said:

Which is what he is doing. You are doing it, too, and now I am doing it. That's what a discussion is all about and the ultimate origin of all changes in society.

Well to me, expressing a wish that people would think his way is not really much of a discussion.

Note: I didn't reply to the first part as I simply disagree.