TL:DR - We don't all have time for people that can't communicate effectively, like you.
Full Text: When you type in all caps, people stop paying attention to what you have to say. You come across as someone with nothing 'real' to say at all, and you also come across as someone that can't seem to communicate in a rational and effective way. When on G+, couch your statements & arguments in normal sized text, and provide a TL:DR summary up front. We don't all have time to read everything you have to say, nor do we care to, when you're keying in all caps.