You can hold onto any opinion you want but when those ideas are in error you must be called on it. You contribute nothing when you spread falsehoods. Saying surveyors have no accreditation is false. Whether you like surveyors or not is of little value. So unless you have something truthful and of value to contribute then go ahead, otherwise...
Just so you know, marine surveyors are in the same category as home inspectors, there is no government regulated requirement, like doctors, or lawyers, or insurance companies.
There are however, organizations that have established themselves as regulators for the business itself. They define the group to help the business have meaning.
If you can join the group you are deemed to have conformed to their polices and therefore accepted by the community as accredited. But, joining the group is defined by paying your dues and meeting a certain number of hours of training.
Building Inspectors, General Contractors, are really the only group in this category that actual have to take a state sponsored test to be able to do business.
Home inspectors and marine survivors are really a group of guys, and girls, who have created a business for insurance companies. Some are good and some not so good. Just hope they have done more than just paid their dues to join the club that gives them accountability.
I once was Home Inspector.