This was probably Reince’s decision, not Trump’s.
Trump could admittedly push back against the sodomy contingent harder, but he has always known the fact that the issue should be dealt with by the states. A President is to deal with foreign threats, a state is to deal with domestic threats.
Trump only discusses the aspects appropriate for a President.
Insofar as that agenda attacks the First Amendment, it’s gone beyond the states. Obama made sure of that.