It is fairly easy to determine that a collective, as a whole, is liable for some action. However, it is very hard to determine the culpability of any specific individual in the collective in isolation. The net result is that the collective is guilty, but then the liability just poofs out of existence when we attempt to prosecute the individuals separately.
It would probably be better if we assessed the guilt of the collective, then assess the lossless distribution of that liability amongst the members. The liability and guilt is known; now it is just a question of who and what bears the responsibility.
This is not a complete solution as a malicious corporation could argue that all of their evil is perpetrated by Joe the janitor, but it solves one of the problems of liability just disappearing if you make the situation complex enough, and boy howdy are lawyers good at doing that.
The problem of making sure we apportion the responsibility in a fair and just manner will be left as a orthogonal problem that I will not attempt to address here.