I really don't care about the anger toward AB-InBev, but just to answer your question a little bit about whether InBev itself is/was predatory, in 1995 the Labatt brewing company (one of Canada's two large macros) was purchased by Interbrew (who later merged with AmBev to form InBev). At the time of the AmBev merger, Interbrew owned Stella, Leffe, Hoegaarden, Boddington's, Beck's, Staropramen, Bass, and Labatt.
If I remember correctly, Beck's and Bass were already available where I'm from, but after Interbrew bought Labatt, Stella, Leffe, Hoegaarden, and Boddington's came to town. Apart from German lagers, we just had Bass, McEwan's, and a couple other British imports, on top of the few "craft" beers (then known as microbrews) that at the time were crystal malt-heavy.
It was a nice change.
So yes, buying one of the two major Canadian breweries opened up Canada as a market for them. Don't think that counts as predatory though.
On a related note, ABInBev's purchase of breweries like Goose Island, and Heineken's purchase of Lagunitas brought those beers to where I live (actually, I'm pretty sure GI is brewed here in London ON at Labatt, at least it seems to indicate as much on the can). So while some bemoan the loss of "craft" breweries to the big companies, others might be happy to get a chance to drink these beers. Labatt is doing a good job with Honkers as far as I'm concerned. The IPA too.