Roughly nobody is going to come up to you after you've helped them put in a fence and say it must be your fault the animals got out last night because you helped them put in the fence six months ago, and you need to come fix it right now. Nobody is going to come up to you after you gave them some chicken soup while they had a cold and say it's your fault they now have cancer and you need to come fix it. But for some reason, a lot of people will do this with computers. Not everybody, and if you have a user who is actually reasonable about it then by all means help them. But be wary about it until you see how they act with computers (which will not necessarily be how they act for anything else) and be ready to cut them off if they start abusing you.