There is trust and then there is abiity. The solicitor who messed up a will with the directions to the SMSF trustee on death may have been honest, but he didnt know what he was doing. He was negligent in the preparation of that will. If the client died then the solicitor could be sued by the benenficiaries who missed out.
Most lawyers think wills are easy. You just get a template and put in the names. But these are the dangerous types of wills. I paid $20k and took 2 years to do a masters degree in wills and estates. If it was that easy such a course couldn't be run.
I would say the solicitor who messed up wasn't honest. They marketed themselves as being able to do something they didn't know enough about. He should have known what he is doing and if he didn't he should refer the client on - to a specialist.