This is a part of Kal'tsit's negotiation to convince Wei Yenwu of Lungmen to join Rhodes Island's cause. While it is true that Lungmen is successful in dealing with unarmed Infected, they haven't dealt with organized Infected riots before. She ends her statement with this, explaining why her faction, despite being infected, is more suited against the Reunion Movement:
Kal'tsit: From our experience... Only the Infected are capable of countering the Infected.