There are lots of definition and explanation about careless and brave. You can even write a book just to discuss about both terms and their difference.
But, to me both looked very similar.
Do you know why? Some people said that the act done by the people in the above photo as brave, some others said careless.
So, to make it fair, let’s say that the act was careless brave. So, everybody is happy.
Although, I think the correct word for the act is S.T.U.P.I.D