Scare tactics notwithstanding, if you’re in a society, and taking from that society, and where everyone else is giving to help make the society better, then you have to do your part as well. What is so bad with that?
Nothing, and since we all hopefully agree to Chazal”s assessment that limud haTorah is a tremendous benefit to all, and their proclamation that one who says “mai ahani lon rabbanan” (the Torah scholars are of no benefit to us) is an apikorus, we can put to rest the notion that the b’nei yeshivah who are learning are not doing (more than) their share.
And Nationa Service is not a quasi-acceptable replacement, it is an acceptable replacement.
Why is national service an acceptable replacement, when a major part of, if not the whole tayna, is that the chareidim refuse to put their lives at risk?
In the U.S., for example, there is no requirement for national service, and even if a draft became necessary, it would be to populate the military, not to run soup kitchens and sweep hospital floors.