I really don't understand how anyone could blame Button for the Alonso incident. He was right along side him up to the chicane but Alonso tried to carry more speed in (he clearly released his brakes before Button) and cut ahead mid corner. Nice idea and it might just have worked but it didn't. If he'd have not cut across so hard he could maybe have got him on the exit of the chicane assuming he could get on the throttle and make the corner. I don't think he could have personally, it seemed like Button had the job done and then Alonso tried a last second fight back that ended up with in in the wall. Textbook racing incident but, if anything, more blame should lie with Alonso for misjudging his counter attack.
I don't think Button could of done anything different in that situation and I don't think I would have done anything different to him if I had been in that situation. I think Alonso could have done something different and I think I would have wanted to do something different at the time (though it's easy to know what to do sat in my comfy chair at my computer), though I'd probably have done something similar in the end and then regretted it.