How can protestors prevent from others ( popo, gangsters,....) to take advantage of these wonderful opportunities to:
1) steal, looting
2) tear / burn down small or big buildings and offices,
3) etc..
and THEN:
1) put the blame on all protestors ,
2) create hate and bad impression from HK people
3) reduce support of protestors
4) create supportive reasonings for other charges and regulations.