Or are those responses as professional as they can make themselves sound? They didn't seem that arrogant to me, just very political and containing context. Microsoft is a HUGE company and it has gotten in trouble more than once for various things.
And, forgive me, but how are their responses bad? In particular, I found their response to why IE doesn't do silent updates to be incredibly acceptable! (not to mention if any browser were to pull a stunt like auto, silent updates, they'd be assaulted more, to no end)
"One of our principles with Internet Explorer and Windows is user choice; this shows up in many places including our approach to updates. We believe users are in the best position to make decisions about what software they want to run. IE is the most widely used browser including being the most trusted and widely used browser with businesses.
As you can imagine a hospital with a multimillion dollar patient tracking web based application doesn't want a silent or automatic upgrade to their browser that could in fact jeopardize their patient's safety. For consumers, we have Windows update which provides a simple notification that a new version of the browser is available and lets the user choose to install or not. Again, customer choice is our overriding principle." (from link)
Also, a question: what would you have wanted them to say? "No, because we'd get in trouble"? Or, "This is the situation. Because of this, we say no".