When at war, there are 3 possible outcomes.

Either you win.

Or you lose... And the enemy takes your territory and governs your people. This is bad.

Or the war drags on for years, killing generations of people. This is worse than losing. The human costs are far bigger. Children grow up learning how to fire an AK47 before they learn to write.

Guerrilla warfare usually ends up in that last case. That's why I wouldn't suggest anyone advocate for guerrilla warfare. It's simply a way to kill millions and end up with a permanent stalemate.