I absolutely agree. I was also very disappointed by the many far-right statements and symbols I saw on signs. Sure, it might not have been the majority, but I can't understand how you're able to join these protests if you don't agree with the others' statements.
You're assuming "with a tractor" was the only way for farmers to show up to these protests. It was not; many of them showed up in plain cars.
> impact of those protests was quite high
Indeed, mostly because they were very disruptive. Despite prior assurances, they even hindered emergency services in performing their jobs.