Agreed, the only problem I have with it is when it is predictable. It can seem cliché when a weaker character puts him/herself in danger to protect a stronger character, just so that "hero" character then has to rescue them. I suppose it depends on how it is executed.
" I don't think it's about weak and strong. I don't think they're thinking I'm am weak, therefore I must protect someone who is strong. I think it's more about characters protecting a person that they like, love or know must survive. "