People died because of the last set of protests. That's not a reasonable consequence of a public protest.
Ambulance took 40 minutes to attend traffic accident because roads were blocked. Accident also occurred on M20 where traffic was rerouted because other road was blocked.
Perhaps I’m not understanding, but is it legal to be climbing and stay high up on the cables on a major roadway?
Allowing protests only in some alleyway where nobody is present; or if a government can simply and easily apply postponement/cancellation tactics: This would be a problem as well.
Specifically the current 'protests', be it blocking roads or criminal damage, do not serve any constructive purpose at all. They are carried out by the 'usual suspects'. They could organise a massive gathering in Hyde Park (and similar in towns throughout the country), for example, that would get huge media coverage as well without causing problems, ah but that wouldn't be 'direct revolutionary action'...
In the US, we have other disruptive events such as marathons; parades; Presidential convoys. All of which can disrupt main roads and aren’t even protected.
For example: https://www.amny.com/transit/nyc-marathon-traffic-guide-stre...
The difference is that this is planned; and whether reasonable accommodations and alternatives are provided, if it’s too disruptive.