OK I know some folks really dislike when I say "that's just how things are and there's nothing to fix", but I'm going to say it again.
First of all, it only takes 5 people to close a question. I don't know for certain, but I'm confident that almost no-one on the site is able to thoughtfully review every question that is posted. I'm lucky if I can do a couple more beyond what's in the review queue each day. I think it looks like there's more lack of consensus than there actually is.
Many questions get edited in response to close votes which makes them better, but they end up getting closed because some folks jump on the bandwagon if the close vote looks reasonable to them. I respect the folks in this community and sometimes I don't review as carefully as I could because I trust the other reviewers' judgment on whether something is a duplicate or off-topic.
You asked me "How can we fix this standard lowering?". Why do you presume that your standard for questions is the right one, and anything below that is broken and needs fixing? Yes, it's messy when you have a lot of diversity, but it's also a really good thing, because it makes us constantly evaluate why we do things the way we do them. Is it frustrating sometimes to have to constantly try to persuade folks to see things the way we do? Sure, but it's good for you :)
We not only have diversity in our community, we also have a lot of diversity in the questions and how they are posed. We could vote to close every question that asks "what does this word mean in this sentence?" as answerable by a dictionary, but is that the right thing to do in every case? Sometimes sentences are ambiguous to learners even after they've read their dictionaries but native speakers don't see it because we just know without thinking what the sentence means. Sometimes the folks asking should have put more effort in, but if their English skill is limited, a simple question may represent a lot of effort.
I think many closed questions aren't clearly "close-worthy", like Why is a "coat of arms" called so? I voted to close that question because I'm a little pedantic about etymology being off-topic because it's listed in the help center as off-topic. Does that mean that StoneyB and I have irreconcilable differences? No, not at all. I understand why some folks don't want to be that strict about that one word on one page in the help center.