For context, we have one child with diagnosed ASD, who internalises anxiety, and one child currently being assessed with CAMHS who has 'significant anxiety'.
A couple of weeks ago I booked a holiday to Majorca with the DC, also paying to take one of my parents along as an extra pair of hands. This holiday will be our first abroad (except DLP) and their first flights, so has been built up over a long period of time.
The kids are all worried now, as last week their dad decided to tell them that many children get kidnapped abroad and are never found again 
I discussed it with him this morning, and he "just wanted to warn them to be careful", and is "anxious about them going away". I said that this isn't about him, that his careless words have a huge effect on our children, ad that he should have discussed any concerns with me, not the children. I may now have 10 months of anxiety from the children because of his comments. He reckons he told them about it now "so they have time to forget about it before they go".
AIBU to expect him to not act like this? The kids are 8 and 11.
(He has previous for saying things to the kids, walking off without making sure they understand, and I'm left having to deal with the fallout of them trying to process it.)