Of course it doesn't make software worse, but you make it sound like it's the only factor in software quality. Far from it, and IMO the degree to which it has become a religion is disturbing. I suspect that might be the source of the downmods.

I've seen projects with more tests than code, and I think that shows a problem with development methodologies. Simply reasoning about the flow through the code (and possibly using a powerful type system [think Ocaml] to help catch errors at compile time) would remove the need for many of these tests (not all tests should go, of course) and would result in tighter code.