Talk to women sometimes about how they approach personal safety, and how many scary situations and too-close calls they've already had.
It's a law of truly large numbers thing. Even if a tiny tiny minority of guys are actually dangerous, over the course of even a relatively young life the average woman has encountered quite a few of them. They make life decisions accordingly, for understandable reasons.
The app could certainly facilitate "safe" dates by helping guide people toward certain places. That could even be the business model where you would book reservations at certain restaurants, coffee shops, or wherever through the app.
Frankly I don't think gatekeeping a person's comfort level when meeting a stranger is very constructive. In fact I think it would invoke quite a negative reaction (justifiably).
Meeting strangers may not be a high risk for you but it is for other people.