Method 1) Some negative effects kill those who come to them – this means that there is a risk for the journalist, and the players who have already completed the survey may still be remaining negative effects, which wouldn't be the case without this feature. And at the same time, you can limit the number of blockers everywhere.
Method 2) The journalist can wait for people to come to him instead of going around to interview them – but it's more difficult to figure out how to do this, and I can't say offhand what it will lead to.