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Why induce tse2 expression only when a gram-negative pathogen is present?

     A type six secretion system +/Tse2 + strain of E. coli could be administered like a traditional antibiotic after a pathogen infection by having a strain that constitutively expresses Tse2 and Tsi2. However, this would be a fairly brute force method of anti-bacterial comparable to traditional chemical antibiotics in its damage to the gut’s natural flora, and is only advantage over chemical antibiotics would be the current lack of Tse2 resistant pathogenic bacterial strains. If Tse2 expression is induced by a chemical signal  indicative of the presence of a pathogen, any unintended disruption of the natural gut flora will be limited to the area infected with pathogens, and the risk of Tse2 resistance would decrease.