The ominous four-word warning is a familiar one to anybody who ever had a mother. "Don't talk to strangers." But the problem with strangers is not that they are strangers; the problem is if they remain strangers. Sorry, mom.
When someone I don't know uses the template and doesn't add any personal note that might peak my interest, then it is "ignore" or delete; whichever is quicker. But if someone reminds me of how we met, or references someone we both know, I'm more inclined to take the risk and accept.