Having trouble translating this: 多是不跑步的替跑步的操心 My rough translation is "better not to run than to run and worry about it." It's the double 的 and 替 that's throwing me off. Is my translation close?

Here's the context:

最令人啼笑皆非的是，有关这事的争吵，多是不跑步的替跑步的操心。至于说，顶着雾霾跑马拉松会形成不良的示范，更是无稽之谈

It's the second to last paragraph in the article below:

http://news.ifeng.com/a/20141020/42245256_0.shtml
Not quite; I break this fragment like this:


多是
不跑步的
替...操心
跑步的


The word "多是" is a bit tricky too, as in this case it's an abbreviation of "大多是", or "mostly is".

So altogether, it should be:


  , mostly is those who don't run worrying on behalf of those who run.


Of course, this direct translation is awkward, so it might be better to rephrase it according to the preceding fragments. Here's my crude attempt:


  What's most laughable about all this hullabaloo, is that it is mostly coming from non-runners worrying about runners on their behalf.