That's not fair to the leaders. In WW1 the upper classes suffered substantially higher casualties than the working class, many of whom were exempted from duty due to crucial work in mines and industry. Many of the generals and political leaders lost sons in the trenches, where it was still customary for young officers to lead from the front (Ludendorff had a nervous breakdown after his second stepson was killed). They knew about the carnage, and all but the most cold-blooded were appalled by it. The problem was that though nobody knew how to break the stalemate, each side felt the other must be on the verge of collapsing.
And it's easy for us to stand back today and say they should have accepted a white peace. But it would not have been only the upper classes who would have balked at chalking up such dreadful losses to a draw. Look at what happened to the German leaders who eventually did acknowledge reality and sue for peace - they were accused of betraying their nation, and sowed the seeds of fascism among their defeated countrymen.