@"A trans person who has lied to their spouse about such a huge part of themselves may well be treated with love and compassion despite this betrayal."
Betrayal? lies? First, what makes you think they knew this about themselves and weren't in denial and lying to themselves. What is it not the person's responsibility to know their partner before marrying them?
You have immediately jumped to the conclusion that it is always the 'fault' of the trans person - which contributes to the huge numbers of trans folk murdered world wide... they are blamed for being who they are.
However, the right to a family means the state should not be allowed to take your family away from you without just cause - and a fair procedure, like a fair trial. But instead you're jumping to conclusions and allowing a situation where the laws allow for automatic removal of parental rights.
Seriously, you don't see how this infringes on the 'right to a family'?
@"However a betrayal it remains, and if the spouse chooses to react differently the law should be firmly on the side of the wounded party."
BS, the 'wounded party', there you go assuming that one party is harmed by the gender identity of the other. You have every right to get to know someone and to marry them. And if they change, like choosing to go join the army, or quit their high paying job because it turns out they'd prefer more time than all the money they used to earn, you can't go around claiming to be 'the injured party'...
You could file for a no fault divorce. And that would be fine. Claiming that they've changed and thus the reasons you married them - the material circumstances - are no longer the same. So you should entirely be able to file for divorce. But forcing someone to lose access to their family undermines their rights.
As for the medical approach, it has its own issues, but you can see why homophobic twats would support calling all gay people 'sexual deviants' and we as a society are more inclusive by not labeling them as 'sick' just because of some 'medical model'.
The same is true for trans folks. If they have body dysmorphia, that needs to be accurately assessed before (potentially life altering) surgery, but not all trans folk have particularly bad body dysmorphia. Not all want any surgeries, and none of that is anyone else's business (outside of the doctor-patient relationship) - including their government.
I assumed the least we can agree on is that we don't want the government in our bedrooms or looking down our pants.