English term (edited): it’s not just something to shout

If you reflect a little bit on the situation, the meaning will become clear.

Here we have a person whose brother, a soldier, has been killed. He is being interviewed and asked about his opinion on why he thinks his brother died, or did he think that his brother died in vain?

Any one would answer like the that, with a tinge of sadness, and in a bit of a dilemma. On the one hand he would want it to be that his brother didn't die in vain, and on the other, he would be much affected by the death of his brother and would tend to be philosphical about it.

What the person is trying to say is, martyrdom and all is fine, but we must careful that it doesn't turn out to be just a slogan or an empty boast, there must be some substance to it, there must be a worthy cause for martyrdom.

It is my belief that the person being interviewed half believes that his brother died in vain, and he is hardly a martyr, for the cause for which he died was not good enough, which is why he is making all those negative statements.

Probably he also thinks that his brother was led astray by the polemics of politicians and paid for his folly with his life.