You are talking about cry babies, with no idea as to who those people are?
If these people run Banking websites, or ecommerce, or anything which does involve the transmitting of personal data between client PC and server, then SSL should be applied and customers using a site like this which is not secure should be warned.
However, what about the situation where the site is a promotional site for a business. It doesn't do ecommerce, and has no data transfer (apart from someone snooping on which pages you visit, which when it comes to a brochure website.... there's probably not that big an issue). In these cases a warning is a bit over the top. The users this is designed to help are the same users that when they see this message are likely to drop their bowels and quickly navigate away from the site. This then results in the website owner seeing a significant drop in traffic.
So the choice here is either get a certificate and slow down your site and increase hosting/bandwidth costs or don't go secure and expect a number of your customers to get scared off because of the warning message telling them that the site will result in them being scammed out of all their money by a Nigerian Prince.
BTW I agree wholeheartedly that any sites where personal or financial data is transmitted should operate securely.