you didn't have to choose their side.   rotterdam was justified in a mindset of german ruthless efficiency. whether or not we had to be invaded was another question, but once it was decided we had to be included in the third reich, a swift surrender is much better than drawn out escalation and costs less lives. keep in mind that from their perspective they were benevolent towards the dutch. also, the bombing of rotterdam could have been prevented. the mayor of rotterdam was going to surrender, but the german official demanding the surrender had failed to sign the letter. the mayor replied that he would like a properly signed letter, but by then the bombers were on their way and the germans were unable to call them back. or something along those lines, i forgot how exactly it happened.
Netherlands