It does not make them more likely to engage in optimal charity, it makes them more likely not to engage in charity at all.
It may make them overall less likely to engage in charity, yes, but if they do, it also makes them more likely to engage in optimal charity*. Since optimal charity is something like 2-3 orders of magnitude better than this particular instance of fuzzy charity, I should be willing to cause a lot of overall drops in charity in exchange for diverting a small fraction of that to an optimal charity.
* If it doesn't even do that, though, then I have some serious problems on my hand.
The next time people are presented with an opportunity for charity(any opportunity), their last memory is now changed from 'hey, I was charitable a couple of months ago, and that was nice' to 'hey, I was charitable a couple of months ago, and this optimal-charity jerk made me feel terrible about it.'
You're making them less likely to give in general, and, by being rude about it, you're also damaging the PR brand of your cause, which will hurt you more than you think. I don't know of any corporation that advertises its product by abusing its customers.
Saw this on reddit.
http://www.reddit.com/r/atheism/comments/ydsy5/reddit_help_me_find_some_peace_in_dying_young_im/
I couldn't help be moved by this. I felt a very strong sense that she is one of us, whoever "us" is. Looking at some of the negative comments and worst of all bad arguments people are using as reasons not to donate made me more upset.
I hope some here might join me in dismantling them. I'd also encourage those like me for who this buys a lot of warm fuzzies to donate. Though it might be wise to wait until we hear from CI or some other third party on the matter.
Edit: She has since made a comment on LW! The provided information has made me pretty much certain that this is a genuine plight.
redditors where willing to give her money to go skydiving, they don't want to give her money to buy cryonics. Sometimes I can only weep.
I think it pretty clear that promoting efficient charity in that particular thread is very unlikely to result in people giving money to better causes. Also I just plain want her to be rewarded in some small way! Note the part starting in the second paragraph that I bolded, not only did she realized what she really was, but she stepped over the entire set of pro-death rationalizations and faced the social pressure people she loved exerted on her because they think she might go to heaven ... its not her fault that a few cells in her brain went haywire before she could afford an insurance policy, I just don't want people like that not having something to show after getting so much stuff right.
2n Edit:
For anyone who just realized the universe sucks and wishes to do something about that whole people dying thing, they are welcome to engage in some optimal death defeating philanthropy by donating to The Brain Preservation Prize that has been endorsed by both Robin Hanson and Eliezer Yudkowsky.