The risk to the child for a specific situation does not change based on the reason why a parent put the child in a situation, the same way that the probability of getting hit by a landmine doesn't change based on whether you're walking across a minefield to cheat on your spouse or to save a baby.
The researchers wasn't asking "how good of a parent do you think they are", they were asking "how risky do you think this behaviour is", and it is irrational to be changing your estimation of the risk in a situation based on the reasons for being put in that situation (but what else is new when it comes to human psychology).