Yes.

No.

(Yes, it protected independent creators from having their work directly monetized by others, like Disney did.)

(Yes, by providing protections for creators to profit from their own works, it motivated some number of people to write, compose, and create who might otherwise not have done so.)

(No, the government did, using copyright as a pretext.)

Note that points one and two do do not suggest that copyright is useful in its current form, rather than its history 14/28-year form.