Ignorance is bliss... as is Denial
Hm. Is any life truly worth fighting for?
Life is something that provides the opportunity for experience. "Life" is essentially nothing without memory.
That is to say, a truly fulfilled life cannot be attained without experience.
There is absolutely nothing wrong with living a vicarious life... to a certain extent. There are limits to everything, including life itself.
Experience is what makes life worth living, and, dare I say, worth keeping.
What is the point of fighting for a live that one is not living?
Now, of course there are exceptions.
A vicarious life may bring a small handful of people in this world true, pure satisfaction. For instance, I'm currently squeezed between two pillows on a velvety couch covered in food crumbs, perfectly content with living my life through the lives of those behind the screen in my hands. There is nothing that I plan to do to change it. And I would fight to the death for this life.