In what ways did Randle McMurphy cause only problems for the patients in One Flew Over the Cuckoo's Nest?I think that his aim was to help them,...

I don't buy into this argument, but it could be argued the
patients had a liveable routine down before McMurphy came and disrupted their peace. 
Although none of them were actually happy on the ward with the Nurse, they managed to
seek solace through the bonds they made with each other by taking part in little
hobbies, such as poker, that got them through each
day.

Since the Nurse needed her control, she made the men
as dependent on her as possible, and, therefore, they could never be considered cured or
get released. Most of the men were aware of this, and although some would deny it, they
were happy about it because returning to the unstructured real world was most of the
patients' greatest fear.  In other words, they were living peacefully in their comfort
zone until McMurphy came and disrupted it.