When programs volunteer to parse things in possibly unexpected ways, you tend to open up security holes where most people wouldn't expect to find them. In that situation, no matter how much you jump up and down and point the finger, the convenience of parsing is itself a real problem.
You've been pointed to a case where real programmers had real security problems stemming from PHP's willingness to parse when programmers using PHP did not expect PHP to do that because other environments don't. You fail to see that this is a problem with PHP, and only think of it as a problem with programmers.
Your willingness to accept that programmers should need to know more than they should, combined with an unwillingness to rethink your beliefs when presented with evidence that this has lead to real problems, is a perfect example of my point that PHP, "has attracted a community that fails to recognize these things as problems."