So when you object to something when is it OK to destroy property to maek your point? How many people need to object for it to be OK? If I think a Tesco's is harming the environment or a GM crop test is not safe when is it OK for me to destroy property?

I would say that unless if I had direct proof that people will be physically harmed the first civilized way to deal with it would be to bring it to the attention of the government - including local government and local and national news agencies. Also alerting NGOs could provide resources to fight against whatever is the problem

An NGO also has resources to mount a legal action.

I could also activate a demonstration or march - but it is not appropriate to destory property

Destroying property whether Tesco's store or an GM test site is not legal. This puts us on a par with criminals and thugs. Peaceful protest is not violent. Just becuase I think something is wrong it is just as fascist for me to try to impose my will on others as it was for a fascist government or company to do so.

It's it hypocritical to use destruction of property as a mechanism of protest. I assum many would disagree