Nope, not bad at all, and frankly (although not PC), it's quite a rational and justifiable feeling.

People suffer enough when the abuser is alive. Do not make the mistake of imposing more suffering on yourself for the relief you feel now that they are gone. Even IF it were wrong, how you feel about it now would not change the outcome (their death), so don't even go there. I mean, go there if you want, but I wouldn't!!