Debtor's prison is pretty much universally considered a violation of basic human rights. In the US there is even a strong contingent of legal scholars who feel that cash bail cannot be justified.
I apologize I don't have time now to find a source for that.
In 1963, members of the Council of Europe, an intergovernmental human rights organization based in Strasbourg, adopted the Protocol No. 4 to the Convention for the Protection of Human Rights and Fundamental Freedoms. Article 1 of the protocol states that "no one shall be deprived of his liberty merely on the ground of inability to fulfil a contractual obligation." Currently, 42 states have ratified the protocol.[74]
I'm not a legal expert, but this talks about "inability to fulfill a contractual obligation" rather than the refusal to do so.
I assume the problem is slightly different and it is mainly a problem of not being able to go after the money (perhaps at reasonable cost) if the travelers have it?
Or provide collateral. And chuck them on a wanted list for the EU. If they ever return, they get detained and have to pay and sent home.
I'm pretty sure dutch tourists will just get the fined forwarded to them through the CJIB (the Dutch fine collection authority). So fleeing the country does not help.
Europol has wanted lists, and just recently dutch wanted goons where arrested in Spain. If anything there is more need to European cooperation on the apprehension of criminals and border control.. not less.
There are many cases where murderers were allowed to leave the country under the "pinky promise I will come back "
For example Rassoul Bissoultanov
The Spanish system is overburdened and someone is finally judged guilty after years and years. Meanwhile, if leave the country, good luck finding them again.
They can't manage for murders and robberies, adding block lists for petty crimes would only exacerbate the situation
And we talking people skipping out on paying fines they deserve.
If it where up to me I'd allow the Guardian civil beat anyone in an inflated penis suit, untill the whole thing was flaccid and they could pour the occupant out through one of the airholes.. but that's just me.