JR,
I believe Banshee already said in a post, "Most humans don't remember the memories of a former life-time." ie some do. I would be curious as well whether Banshee has had recollections of past lives myself, but there is no reason to be so agressive about it. I've heard some remarkable examples about people deemed to be the reincarnation of a buddhist holy person to pick out personal objects and such. There are of course alternative explanations.
I think it is a major failing of many, particularly those considering themselves to be hard nosed and scientific, to overly discount the possibility of things not explained by current science. Not even necessarily extending the argument to things ruled out by current scientific dogma.
Scientific theories often can't explain phenomena completely and then the general rule is to stick with the best current theory as a working hypothesis. A lot of disagreement on these matters is based on acceptance of data.
Especially since no one could predict the type of thing that could trigger memories of past lives, there is no reason to think one can readily test this in a lab (unless there is good historic documentation of the person's life and they can answer questions they shouldn't be able to, and couldn't possibly had access to the data). For those who experience these things directly, it would make some sense to accept the best explanation even if it isn't well substantiated by the common societal perspective.
This same happens often in science. Even in the lack of data some follow intuitions and suggestions put forth in the environment. I admit sometimes people may even believe things because some people say cool shit you want to have be real.
Maybe you do people a favor to force them to be critical about it - especially speaking to a scientist who really seems to be out there on a limb. On the other hand if they aren't forcing their beliefs on anyone, there's no reason to be so argumentative.
Having an open mind is very important in the actual practice of science. I'm not saying that I accept that past life memories exist, but there is no reason to be rude to people who do believe in them. If you are actually curious you should be nicer and if you just want to be argumentative you should just be quiet.
Then again there seems to be some anecdotal evidence on sciforums that at least some people enjoy combative debate with those who don't hold their views ...
(Not sure if I'm one of them or not ; )