I agree with the statement that pilgrims should not ignore warnings and put others at risk as a result (I too have been on rescue missions, and while I think those who do this accept it as 'part of the job' we get testy when friends are lost saving someone from themselves).
That said, I've read conflicting accounts of the two cases we seem to be referencing. For the pilgrims lost in the summer, some accounts say pilgrims, others tourists on a day hike. There is no mention that they sought advice about leaving at 4 pm from the pilgrims office, for all we know they went there (if at all) in the morning, or the day before...when I went I was given advice on the routes and where to be careful, but no one mentioned a 'last call' time for departure. If they were pilgrims, perhaps they were planning an hour or two walk up the road on Valcarlos, I think do-able (if not advisable) in (?early) August. I have been lost before, and I will admit missing that last turn on Napoleon and taking a steep descent into RV. I was lost more than once on the Norte. Once you are lost, it is not always easy to find your way back.
The Brazilians, if my reading Spanish (big if) is correct were walking in March, and during a storm, but I don't know if they were on Valcarlos, or if the storm came unexpectedly after they started. I know from experience the weather report can say 'some periods of rain,' and it can instead become very snowy very quickly. The reason they needed rescue was not due to the snow (though that complicated their rescue). One pilgrim had problems related to his diabetes (again, I'm not really conversant in Spanish), and when his companion when ahead to get help she fell into a ravine, breaking her leg. Both of these things can happen, even with good planning and good weather. IF either pair of pilgrims was ignoring advice given, then they deserve criticism for that error, especially if they were on Napoleon when it was closed. But I do not think they should be criticized for becoming lost.
It's a well-known reaction among those who fly to blame the pilot in a fatal crash for doing something stupid--otherwise, it means admitting that we ourselves are in a risky business courting death. Luckily all four of the pilgrims I mentioned survived, and could even read our comments.