"Isn't IT a tool to help rather than a force to takeover business aims?"
Absolutely - a point lost on too many, I think. In some places, IT staff understand that, and work to support the outfit as a whole - so you get the marketing people a new domain, a Wordpress install and some email addresses if that's what their plans call for, the design people get Macs, whatever helps get the job done best. Others, you get power-crazed obstructionists giving everyone a locked-down XP box and telling them they have to use Sharepoint instead because it costs money, whether it actually suits anyone or not, and no, the graphic designers can't have any graphic design software because it's too much effort to install for them.
I've seen both sides of the coin up close. The day marketing say "we need X, $company retails that for $10k" and the IT department's reply is "no, you have to go through us and it'll cost $50k", the IT department doesn't just need to start taking orders from other people - those orders need to involve fries and mikshakes. Conversely, if the answer is - honestly - "$company's product won't do what you need, you'd be better with $otherthing because of A, B and C", marketing should listen to it.