Even then shutting down the anxiety and paranoia is a good idea. You're friend didn't know how to process reality without feeling negative, maybe. But it can be done and they should probably learn how to do that. A calm & confident person can still see if a problem is coming, the real world isn't determined by the feelings of the viewer but by actual evidence present and a very fine sliver of basic world modelling. The difference is a well grounded person will just note it and feel pretty good about the whole process as they brush dust of the resume and start job hunting. Did their best, had a good time, made some friends, exciting new opportunities, etcetera.

Nobody has to be a pessimist to make accurate forecasts. It doesn't even help. The more your emotions and personality influence the forecast the worse a forecast it is, the future does not rewarp itself because the viewer feels positive or negative.