That's a terrible reason to go to law school. Too many people do it not because they think they'll like the work but because they can't really do anything else. They often can't do law all that well either, and almost always hate it.
Also, it makes little sense to go to law school unless you get into one of the top schools in the country (or get a scholarship at a lower-ranked one). The cost is nearly the same, and your chances of getting one of the coveted $160,000 per year jobs are almost nil. Unfortunately, too many applicants think a law degree--any law degree--is a ticket to success.
I can’t examine the motives of all the people I know who went to law school as a second career, but presumably most have done it not to get rich but because they thought they could make a difference or because some aspect of the law intrigued them. Clearly they thought it would be a good career.
Most people anticipate that they’ll like practicing law. Unfortunately I don’t know anybody who practices law who actually likes it, and too many really hate it. I have been troubled when I’ve heard of friends preparing to go to law school for this very reason. My own lawyer tells me that the profession has changed in the last twenty years and he told his own kids he wouldn’t pay for them if they wanted to go to law school, he hates it that much.
But the credential is a good one to have even if you’re going into some other field. Or at least, it used to be.