A post about work and the army for the ultra-Orthodox

Peace and blessings
Lately there has been a lot of shouting about the Haredim being parasites, freeloaders, etc., and I was satisfied that this is true? Common sense says that yes, indeed the Haredim are parasites, but I lack [lately I saw that they asked about this on the site, but the Rabbi did not explain too much, even in column 3 of the Laws of the Rabbi, he only brought it up as a basic premise that it is clear that the Haredim are parasites, but you did not explain it] the Rabbi's logical analysis in order to put what is clear into practice.
I saw three articles on the TSA website, but each one touched on one point of view, and even that one wasn't clear to me.
I would be happy [I believe that the other people asking about the above issue would be happy too] if the rabbi would write a post about why the ultra-Orthodox must work and serve in the army from two directions: A. Torah – is there an obligation from the Torah? And why is it not null and void because of the high chances of spoilage? on. Moral and democratic – each group has its own beliefs. Who hates the island? third. And are the ultra-Orthodox really oppressing the country?
thanks.