I don't have the same sense of outrage that is brewing (no pun intended) over this.
Should Brewdog have called of their overzealous lawyers (if in fact they even knew about it before it hit the press)? Probably.
Do Brewdog have a right to defend their trademarks? Absolutely.
I'd wager most businesses big and small would probably act in a similar way if the circumstances were repeated. I reckon mountain goat might have had something to say if there was a bar somewhere that dubbed itself the Hightail Hotel, or Bridge Road Brewery might get the lawyers involved if a Bar in Richmond called itself the Bridge Road Brew Pub.
Brewdog may have started out as punks, trying to stick it to the big brewers, however they are now a large(ish) producer, with an international footprint who need to protect their bottom line to remain viable. This includes protecting their trademarks. They're also at a size where the owners are not going to know what happens in every single inch of the organisation. They pay their legal team to look out for their business/trademarks, and it seems that is what has happened.
I'll still buy Brewdog beers as I think they make good beer, and If I'm ever in Birmingham I'll spend some of my hard earned at the Wolf Bar.
Just my view on things.
JD.