Do you mean the firm of Mcjessy, Ching and Thompson? If so, I still do not get your point. Are you suggesting that a malicious website is posing as a law firm? Or if you had read a little further you would have found that google also offers an explanation on how a legitimate website may have been invaded by a third parties malicious software.
From Google about the same website you reference:
If you're the administrator of a site we've identified with this warning message, learn how webmasters can fix this issue . Note that in some cases, third parties can add malicious code to legitimate sites, which would cause us to show the warning message.
Did you just miss this or did you just conveniently ignore it to support your preconceived opinion?