it can't be that easy, there's plenty of groups that would routinely use something like that for terrorism etc.
It hasn't happened yet, so it must be more difficult than it looks?
I'm only citing experts on the matter (to paraphrase a quote: "all that is needed is access to a modern university's biology lab") but I think the reason we're not seeing attacks like that is that you cannot control a bioweapon - and everyone who is able to make one knows that.