A friend of mine says the media is to blame for wars taking so long and for us losing them, so far I disagree. What do you think?

Pretty much he says that media involvement is the key thing that gets us to lose wars, like Vietnam. I say that how we were fighting Vietnam ensured we wouldn’t win in the first place and that lying to the public (We hid the fact that we were in Vietnam since around 1955 and lied about every body bag coming out for about a decade) is no way for a democratic country to fight a war. Your opinion please?