请问下面这段英语中最后一句是什么意思?

请问下面这段英语中最后一句是什么意思?
At Ground Zero,the site of the World Trade Center destruction,rescue efforts continued into the night.New York City Mayor Rudy Giuliani was asked if Arab-American or Muslim groups in New York might be targeted due to the nature of the attacks.
RUDY GIULIANI:"Just the opposite.They will receive extra protection.Nobody should engage in group blame.The particular individuals responsible,the groups responsible,that's up to law enforcement,and it's up to the United States government to figure out.And citizens of New York should -- even if they have anger,which is understandable,and very,very strong emotions about this -- it isn't their place to get involved in this.Then,they're just participating in the kind of activity we've just witnessed,and New Yorkers are not like that."