What reasons are there to NOT put them in?
The main reasons for pulling the change logs was the fear of putting the software in a bad light and risking ridicule, especially from the competition.
This is going to happen no matter what you do. If the competition is going to slander you, they will one way or another.
Another question is: Should I have facebook/twitter for my company, if the competetion [sic] can use it to slander us?
Better yet, why produce software at all, if people are just going to ridicule and criticise it?
I'm writing this in the hope that you point your management to this discussion and they realise what an incredibly childish move it would be to start hiding information just because people might talk about it. As a CTO, may I say the following: If you don't produce a changelog, and your company isn't one of about three or four whom I'm forced to live with on their terms, you're not getting through my front door. No questions, no discussion, nothing.
As Hamlet famously said: 'Tis better to suffer the slings and arrows of outrageous fortune than to be a secretive little shit that nobody likes.