Can genetic engineering lead to new or more dangerous biological weapons?
Probably. Unfortunately, it’s unlikely to make them worse. It’s unfortunate because bioweapons developed by artificially selecting diseases are already extremely lethal. As far as we know, all existing bioweapons were developed by artificial selection. However, there’s no way we can say for sure that no evil people will try to use genetic engineering to make bioweapons. See these topics in Life’s Big Instruction Book: What’s that?