There's nothing wrong with fireworks....just going to national holiday events to see them. Staying at home and watching from your yard or the yard of a friend, on tv, is fine as long as you don't go advertising it. Shooting off legal fireworks on anything but a national holiday is fine. Bethelites went to the roof of buildings when fireworks were shot off.
9/3/99
"What does an insignificant tea bag have to do with faith?" -J. Lopes
also...No more guests for fireworks roof parties. -Letter from Governing Body
http://www.jehovahs-witness.net/jw/friends/31406/1/What-do-JWs-Do-on-the-4th