Civil engineers are self-confident and don't go comparing themselves to all the other engineering disciplines trying to convince themselves they are real engineers. Software engineering is prone to a significant minority of people who are not so self-confident.
Personally, I am. In my opinion, whenever someone tries to drag in a methodology from other engineering disciplines they do so with a blinding ignorance of "cost" side of the cost/benefit ratio (and often non-trivial ignorance on the "benefit" side too), and the real differences between software and physical things. If car engineers could smash a car into a wall, observe something they didn't like, tweak something and 30 seconds be smashing another car into a wall effectively for free, their design methodology would be different too. (And if you feel inclined to get into a really detailed argument about how it would affect them because you think I'm assuming something about exactly how it would be different, you're missing my point, which is simply that it would indeed be different. Especially towards the beginning phases of the design.)