Unfortunately, frequently in the deaf community, implanting their child automatically means that they want their deaf children to conform to their way of life rather than what's best for their child.
I think automatically sending a child to a deaf school without even looking into its quality and settings is not "looking out for the best for their child" but I don't think a lot of people of the deaf community would question this.
Wanna know how a parent knows what he/she is doing the best for his/her child? Ask him/her why those choices. If he/she has a well thought out answer (whether you agree with it or not), then he/she is. Simple as that.