YMB - //In one heated exchange, a man can be heard saying: 'How can you use dogs against a people's protest?'
A police officer is then heard to reply: 'If you do not leave the field you will be arrested.'
So members of the community can be threatened with arrest on THEIR field but travellers can do what the hell they like ?? //
No.
The member of the public was threatened with arrest for not obeying the instruction from a policeman, which constitutes a public order offence, which is an arrestable offence.
The travellers' trespass action was dealt with separately by appropriate issue of notice to depart, or face arrest.
So no, members of the community cannot behave as they wish anywhere, whether they own the field or not - and neither can the travellers, and the police dealt with both appropriately.
As to why travellers are not dealt with immediately, legislation demands a Court Order, which takes time.