Ah, but the seeker needs to find out if the answer - the truth - is beneficial. You can't not know the truth and make a decision without knowing the answer. That's just guessing.
My friend argues that believing in an afterlife (i.e. religion) is beneficial for some people because it gives them a (patently false!) sense of "security". So why tell them it's wrong to believe such a thing?
My answer is a) the fact that there's no afterlife is the truth, as far as humans know (i.e. as far as the evidence - or lack of evidence - shows); and b) it's wrong to believe in such a falsehood - in the sense that most people with such a belief tend to be either less ethical/moral (because they'll fix up the imbalance 'later'), or irrationally over-moral or hyper-ethical because they don't want to risk their slot in eternity's gravy train. Either way, they act irrationally and abnormally, and for the wrong reasons!
I can't think of much in life that could be worse than that. What a horrible life!