I'm forced to agree with this Slashdot poster. The use of a red X in this context will confuse users about perfectly correct and properly
working websites, particularly legacy sites that carry no practical risks and contain widely referenced information, but that cannot be
upgraded to SSL in a practical manner. The most likely outcome will be users learning to ignore such warnings completely because they will be so widely present and widely viewed as "crying wolf." It is also likely that many sites will push back against Google on this by posting explicit messages on their pages explaining to users that Google is playing Mommy and that nothing is wrong with their sites. It is
perfectly acceptable and reasonable for Google to encourage the use of SSL. However, the approach being discussed is not helpful and is likely to even be counterproductive.
REFERENCE: "When Google Thinks They're Your Mommy" -