I have no issue with what Jean did with the telepathic link since she only linked the mutants and humans and not alter their thoughts. But there is a bigger question not being asked did the X-Men cause the situation that led Jean to do that and I say yes. The soldiers weren't attacking the mutants they specifically said they were taking them into detention and to surrender it was the X-Men who came guns blazing with lightning and claws out which made the soldiers shoot in retaliation. If Jean was willing to use telepathy why not just do it from the start and not cause a potential blood bath?