Well, certainly 'wrong' from the perspective of those who got the drug...

I agree that the whole point of testing is to identify risks. OTOH, there've been claims that this one was exacerbated by poor procedures - had the patients been dosed one by one over a longer period, rather than all at once, there'd presumably only have been one person harmed instead of six. But I don't know enough about how such things are run to say whether that's a practical safeguard to apply.