When French farmers or fishermen block ports and motorways, does it affect emergency services?

Duh, of course it does. Theoretically, so might 'Operation Chokehold'. So might any net filtering. So might a British Airways strike supported by 93% of staff. Should these things be made illegal? In general, no, protest causes disruption, disruption at some level - see UK snow stories tomorrow - costs lives. Life gives you cancer.