Welcome to the positive use of Dark Arts. You can enumerate the exploited biases galore as an exercise.

Indiscriminately calling the soldiers and especially the war dead heroes is quite rational, as it facilitates the country's task of maintaining an enlisted military force, as opposed to a mercenary force. Yes, it's brainwashing, and it is irrational for the individuals believe it, but it is very much the right thing to do for the government. Imagine what would happen if the prevailing sentiment was "well, these dead soldiers weren't very nice people, anyway, so, whatevs".