Why does the Success, Info, Warning and Danger buttons persist? It is one of the stupidest design elements in Bootstrap.
Name 1 use case where you want your buttons to indicate Success, Info, Warning or Danger. And which way does that work: 1) press it and you get danger or 2) press it and then the system messes up and comes back turns the button to danger?
Semantically, there is no danger on a software application. Danger and caution signs are meant for physical harm. The appropriate red mark is error or wrong.