There should be acknowledgement of the recruits for signing up. After that, the message is that they will be tested, pushed, challenged and forced to dig deep to make it. They will need to put out or wash out. They will need to fight for one another. There's really no need to be unprofessional but there's no room for DIs to have to be someone's mommy or best friend.
If you cant handle someone speaking to you in a harsh tone how are you going to hold up under fire.
Is the new concept that the drill sargent doesn't have to wash out those who can't make it because Al Qaeda will do it for him?