Yes, definitely places you don't wanna be at in Valpo at night, unless you - I.M.O. - want to court trouble if that's your thing. Hey, I've known people like that.
Zulu789 and I did some wandering around town; I think we scared the locals more than vice-a-versa, being that we two large mammals outweighed the average Chilean guy by about 40 or 50 pounds each and are also about 5 inches taller than the average local guy. We never had any problems. But then we look kinda scary.
Could be said for any place: I think how you carry yourself and how you look plays a big part in the "thought" processes of a potential mugger/robber, if you look like a lost wide-eyed tourist you're pretty much perceived as prey. If you look like you're more trouble than it's worth a punk will move on to an easier target. I've seen that personally, a guy sizing us up and deciding against it. And that's pretty much the crime in Valpo, targets of opportunity for petty theft, purse snatches, muggings etc.
The danger might be overblown, but, yes, there is some crime danger.