The majority of the country is against it, and there would be less consequence and push back from not doing it and pissing off his loyalists than doing something that furthers his dislike amongst the majority.
And again: trump gets nothing either way. No money, no big signing ceremony with cameras to plaster his face on TV. Unless people can praise him for doing it (and there won't be praise for this. The j6ers demand and expect it, and everyone else will continue to hate him for it.) trump has zero incentive to do it. If there's nothing in the transaction for him, trump doesn't transact.