What I learned during the training is that an objection is not invalid perse because you are anticipating something. If the possible impact is significant, anticipating this is enough of a reason for the objection to be valid. If it's not significant, you can just give it a try and see what happens. If it does have a negative impact, you can create a new proposal.
3.2.4 Criteria for Valid Objections, c
[...] However, relying on predictions is allowed when no opportunity to adequately sense and respond is likely to exist in the future before significant impact could result.
During training, Brian used the example of your neighbor working on a nuclear experiment in his basement. You would object to this because you anticipate nobody will survive an accident. So it's not safe to just try and deal with the consequences if and when they happen.