"No, they ripped off Hamlet for that!"
"And they ripped off The Iron Giant to make Lilo & Stitch!"
"And A Bug's Life is a ripoff of The Three Amigos!"
Oh, do shut up. You all seem to have uncovered the Grand Mystical Truth of Everything, which is that all stories are completely derivative and just rip-offs of the one Ur-Story, chanted by workers who built the Tower of Babel, and from that point on, everybody else who has ever claimed to have come up with an original idea has just been an unoriginal, self-delusional hack.
There are plenty of things you can criticize Disney for, but honestly, the least of their problems is the fact that they once stole the plot from some obscure anime from like 1954 to make an episode of Goof Troop. Seriously, people. Get back to work.