They certainly need help, but, if they are under 25 - and I think they are, this means they were born between 1995 - 2000, that any boy should be brought up in a home in the years since then and have the attitudes they have and carry on the conversations they had is too far over any boundary to be regarded lightly.
No, they shouldn't be punished for ever but neither should they be allowed back into Warwick University, where the women that were the victims of their conversations are still studying and face the fear of seeing them again, not just on a day to day basis around campus but in lectures and seminars as well.
I am very wary of using arguments of sexism. Too many women do this to claim advantage, but in this case I do think it is the classic attitude to the culprits of 'boys will be boys' and that their female victims should just live with it.