Personally I'd remove those target attributes they were "deprecated" from HTML 4.01 for a very good reason and are supposed to be used with Frames only. If you open windows using unobtrusive JS instead they will still function as links with or without scripting.
The only reason they are opening in a new tab is because you set the browser to do so. For _blank the user agent should load the designated document in a new, unnamed window.
In otherwords breaking the navigation back button... since those links on the said page are going to your own website each time you'd click one of those links a new tab/window appears cluttering everything up and possibly confusing the user.
One who is too insistent on his own views finds few to agree with him. Aim to 'let the user decide' whether they want to open the link in a new tab, or window. Most of them will already generally open links in new windows only if that's already their own preferred habit.
The way you have it now they really have 'no choice in the matter' creating unnecessary web accessibility issues. At the minimum when new windows are likely to be spawned; it helps if you inform the user.