I find it rather hopeless that people can "survive the trenches" and tell others" that life is meaningless.
The perspective that affords that life is cruel to some and kind to others, and it's just random and meaningless really doesn't sit well with the people who have to struggle to survive without the chance for joy in life.
If I am just going to suffer endlessly while others enjoy a life of luxury, why not burn the whole thing down? There is a disturbing goal for some people who want equality, and that is universal suffering and misery...
Who are you even talking about? Bob didn't say life is meaningless. If you want the perspective of someone who survived the "trenches" and kept a meaningful perspective on life then I recommend the book "Man's search for meaning" by Viktor Frankl.