Everyone is nervous. If your family is all together in WDW, what can be more wonderful than that? If anything, the extra security there is probably making it safer than a large mall near your own home. Try not to get yourselves sick with worry (I know it's hard) and I agree with the idea to block the world out and enjoy WDW. Of course, don't turn a blind eye to anything unusual you see at WDW and keep an ear to the news for anything important.