No no, obviously. I agree. I'm being very general. But I'd put it like this: if you had to give someone advice on whether or not to go to law school, and you knew absolutely nothing about them and were unable to find out anything about them, and could not expand on the advice (you could only say, "go" or "don't go") what would you say? I know this is a somewhat arbitrary set of conditions, but at it's very basics, I think you should err on the side of caution which is to say "don't go".
Pretty much. The burden is strongly on the applicant to justify going, usually in light of fairly overwhelming evidence to the contrary. This is mostly speaking from a financial perspective of course, but that's why it's clearer cut in law -- most people go for financial reasons -- either to improve their earning power or embark on a stable and well-paid career. It's not like you're talking to liberal-arts grad students in terms of their primary motivations. What many didn't realize for the longest time was that a legal education can be just as dicey of a financial proposition (if not dicier since legal educations are usually costlier).