Do I Say Something or Not?

Today was the first day of school after a 2 week break.  It was rough!  I wasn't ready, the kids didn't want to do much, and my kitties missed.  But I made it through...

Now, the one nice thing about living an hour away is the commute.  Yes, I know it eats up a lot of my free time, but it does give me the time to think about things or to listen to audio books.  

And today's thinking topic was: What do I say?  Or don't I say anything?

Often in a cat group, a question will come up and various people will answer it.  Sometimes the advice is good and sometimes the advice is not so good.  For example, in a non-cat group, someone asked about treating kidney problems.  The standard treatment is low-protein diets.  This is what most vets, not all, will say.  I know from personal experience, low-protein diets don't work and I feed my kidney cats raw diets with about 65% protein.  My cats seem to have few of the common side-effects so I'm convinced this approach is right, although it is not widely accepted.  So here's the problem:

• If I say something, some people may attack me.  True, alot depends on how I phrase my reply, because I do tend to say things without thinking.  This leads people to feel attacked (understandable to some degree), it really is only my bluntness.  I don't have a lot of time to write, edit, think, re-edit.  And even when I do that, my posts sometimes are misunderstood.  I have never figured it out.
• If I don't say anything, the cat may be hurt.  If a person knows something that might save someone from pain or even death, there is a moral obligation to say something.  This should extend to a cat.

Do I say something or not?
How do I say something that is effective and not off-putting?
When shouldn't I say something?

These are questions that I struggle with and to which I have no answer.