Were they actually not breaking Dutch laws? Around terrorism-related activities I would guess the laws are fairly similar across Western countries, partly due to 9/11. Speech regulation has been consistently different between the US and Europe, including the UK - the US even passed laws to refuse to enforce UK libel judgments 15 years ago after Americans became aware of their abusive effects.

If European countries banded together to direct their banks to offer services to the sanctioned ICC judges, for example, I think the US would back down on that - yes even under Trump, although there would be some bluster first.