Legacy and War (Official Business)

[Albert Wesker]

Also, the other circumstances mentioned, including the unorganized state of defenses due to the recent chaos with Demetri and Donnel, three of the defenders being away from the base at the beginning of the assault, and yes, the gap in power from people such as Protomouse all played a part.

So, then, would it be safe to assume that a precedent has been set where, if you get base assaulted multiple times, the likelihood of your bonuses diminish?

That is the general idea, yes, provided of course that the assaults in question are rapid/frequent enough to erode and diminish your defenses or leave them disorganized enough to interfere.