I meant in Harry's 7th year... Then Ron was not part of DA in that year, but with Harry hunting for horcruxes (which was also risky), but Ginny was with Neville and Luna in DA, which was not a very safe thing to do with two Death Eaters in the school as teachers (teaching Muggle Studies and Dark Arts respectively). Ron and Ginny were indeed both in DA (Ron even being a founding member) in year 5, but then the worst thing that could happen was expulsion, as Umbridge would really have gotten in trouble if she actually killed people (not to mention how Fudge would then pay dearly, since she was under his orders after all).