If you have zero trust in an ex, that has 'excessive' when drunk, provides no support towards their child, and who's child prefers not to have overnights with said parent, would you allow that ex to take the child on a Spanish holiday.
That's the bare bones of it. I've tried to keep it impersonal, as anonymous as possible. Im not here to tell tales. Yes I still try to maintain regular access for them. There's a lot of personal misgivings, based on experience, and I'm trying so damn hard to ignore them.