I'll discount everything Murphy suffered in SF and FM out of Harry's guilt account. Murphy got some benefit from Harry's activities back then. Without Harry's professional help, Murphy would have lose her job sooner. The tragedy with the Loop Garu is equally Harry and Murphy's fault, so it cancels out.
Everything from GP onwards is Harry's fault though, Murphy will not be involve in all of them if she did not know Harry.
Similarly, I will also discount. Thomas near sacrifice in BR. Lord wraith is going to eliminate him anyway and without Harry, Thomas will have even less chance to survive. The Nagloshi thing is largely due to Harry though, he literally bring that trouble to Thomas's door.
I have little sympathy for Susan. She tricked Harry to a soulgaze, starting the whole mess in the first place. She ignores Harry's warning, no matter how inadaquate, in GP. Her suffering in DM is mostly due to Martin and the fellowship's business. And Changes is as much for herself as for Harry. Since Susan neglected to tell Harry about Maggi early on, Harry can't be blame for what happened.
Molly though, is the most tragic. Almost every mistake she done and every suffering she endured, is one way or another due to Harry. It might not be Harry's fault, but Harry is somewhat the cause.
The alpha's suffer Curby's death in TC and Harry's suicide attempt makes almost everyone suffer.
I'll discount everything in CD as well, due to the fact that had they did not help Harry, they will die along with Chicago. Similarly, Michael's injury cannot be blamed on Harry. Michael is duty bound to face Nico and his gang eventually. Without Harry, Michael may have died and still failed to saved the day.
So far, only Butters come out ahead from associating with Harry. Thanks to Harry his life becomes more interesting. Thanks to Harry he is saved from Kemmler's disciples in DB, Thanks to Harry he have good accounting in the eyes of WC's wardens and thanks to Harry he have a chance to meet his current girlfriend.
The rest of Harry's friends and associate tends to pay dearly either from Harry's direct mistakes, misjudgement or from just simply knowing him.
Most, if not all of the above is not Harry's fault. However, most of the above also will not happened to those people if they don't ever have the misfortune to meet Harry at all.