Who said "We're here to protect those who can't protect themselves."?

This quote is attributed to Captain America (Age of Ultron).

We're here to protect those who can't protect themselves. - Captain America (Age of Ultron)

"We're here to protect those who can't protect themselves."

Captain America (Age of Ultron) Justice

"I'm always angry."

"The world is in our hands now."

"We may not be able to save everyone, but we have to try."

"I can do this all day."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."