I feel like Less Wrong isn't a good place to turn to marketing tactics if your rational argument fails

So what do you turn to on Less Wrong, when your rational argument fails for no apparent rational reason? The dilemma runs like this:

1. I make my awesome rational argument for the expected benefit of doing X
2. Rationalists on LW decline to do X because of reasons that look not-very-rational to me
3. I try roundabout arguments to try and sneak past whatever bias is keeping people from getting with the program

At least, that's how it looks if you accept the pro-cryonics arguments. Either way, the lack of consensus (and action) on cryonics seems indicative to me of a substantial failure of rationality somewhere... but I'm not sure where.

ETA: I am not advocating the use of "marketing tactics" here, I'm trying to raise the question of what to do when you think your rational argument is triggering something like an absolute denial macro in other rationalists for unknown reasons. "Reconsider if your argument is correct" is a valid response, as is "give up for now".