That's really not how most people make their decisions.

Maybe it's not how most people make their decisions, but I have seen a significant number of people who do reject cryonics on a firmly intellectual basis, both online and in real life. I suppose you could argue that it's not their true rejection (in fact, it almost certainly isn't), but even so, that's evidence against heavy emotions playing a significant part in their decision process.

There are plenty of ways to tell someone about cryonics that don't involve a direct plea for them to take action.

Yes, but most of them still suffer from the "weirdness factor".