I'd assume the chance wasn't given because the risk of forgetting couldn't be taken. He had one shot of dealing with them and had to take it no matter the consequences. Your right that having a race wiped out isn't a usual choice for him to make but the nature of how the Silence worked really...
The child is Amy and Rory's... somehow during his ressurection Amy's memories of him and the Doctor got mixed up so he was reborn as a Time Lord and noone knows yet.
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