There is no question that in terms of ehrlichkit many of the hesder boys are just as ehrlich and torahdik as ponvitch. Its simply ignoring the facts if you say otherwise. Now there are fair questions such as
1) Is torah protecting us and maybe its wrong for charedim who are learning fight at all? Or maybe the Hesder approach of mixing the two is correct. Both sides are torhadik views.
2) What about the securlairm of the army? Hesder boys have a strong system and upbringing that enables them to insulate in the army without being affected. Can charedim do the same? They don’t have that kind of background nor do they really have a system set up in the army like hesder. They also won’t be sedning the strong leraning boys to the army and only the “weaker” boys will go
3) What about the chasdim? You can’t set up a system in the army that satisfies all of Ger’s takunas etc.
Then there is the ideology.
1) Is zionism and the idea of jews having a state against the torah and its views? Sure there is a list of gedolim and tzadkim who were anti zionism albiet mostly hungarian jews and a minor few ltifish like Briska rav and R Elchnonon. But then there were just a ton of rabbonim (too many too list) who were Ok with zionism too. Mizrachi was even initally part of agudah. So both are the torah view
2) After 1948 and the medina was founded. Now the question of whether we should have a country is no longer a question. Now its how do we deal with the secular threat since its a secular state. Here you now have an interesting turn. Big rebas like R Arela Blezer and the lubvatcha rebas who were previously very against the idea of a statehood now said this is the reality lets be part of it once its here. Meanwhile other rebas who were perhaps more zionistic like the rizyna rebas moved towards the “right” realzing that yes we should be part of the govt but at the same time now its no longer a question of “joining up” with them for the ideal of a state. We got the state and we will be thankful but now we have to watch our from secularism.
And thus its two distinct question. Jews having their own statehood many gedolim held yes. Now how about the secular threat? Thats where charedim and hesder went differnet ways on how to build those walls. But again both follow our torah