I wasn't intending it to be a generalized conclusion. It is true "sometimes". I meant it as a counter to the argument that "training" somehow AUTOMATICALLY makes you safer.
Mostly, training is better than not training. But, some people are cocky and think that being trained makes them above the rules or it can make them lax. The infamous "DEA" video or the recent SEAL who shot himself.... Well trained.... Cocky and prone to bad decisions. The training MAY have made them worse. At least untrained they may have maintained a healthy fear. Maybe not, but sometimes.
I wouldn't tell somebody "Nah! Don't get training! You're safer without it!" but it certainly can be the case with some people.