Evo, I have to be honest, with all due and considerable respect, I am quite surprised at this post of yours here. But, since you asked, I will provide my honest opinions
It wasn't
First of all, brucellosis and babesia are nowhere near similar. If my dog gets brucellosis, it can lose its ability to produce forever. If my dog gets babesia, it loses nothing.
Secondly, not everyone "requires" brucellosis tests before they breed a dog, and likewise not everyone is going to "require" a negative babesia test before a show. I honestly can't think of too many dogmen who "require" brucellosis tests when breeding to each other's dogs, and of all the dog shows I have heard about in my life I honestly can think of
no competitor at all who "required" a babesia test before a show. The simple fact is, there is no "governing body" over all breedings to enforce that "everyone" get brucellosis tests ... and, likewise, there is no "governing body" over all shows requiring that "everyone" get babesia tests before they participate. Therefore, the pathology of one person wanting "other people" to do something with
their own dogs is, at best, an unrealistic boundary disorder
Thirdly, I am surprised you take this stance at all, seeing as (in the south) babesia is pretty much as common as roundworm, infesting upwards of 70% of the greyhound and bulldog population. I pretty much EXPECT most competitive dogs (in the south especially) to have babesia, and would be quite surprised if there are many Champions out there that have
not been exposed to the problem. (Remember, for every 1 dog that "exhibits symptoms" there are 20 that have the disease but do not.)
Finally, if
you want to make babesia a requirement before
your show, then simply do so

(How credible or realistic the expectations of compliance will be, however, is another matter.)
I have never had any dog die of babesia, ever, in nearly a quarter-century owning quite a few of them. The only people I know whose dogs have died of babesia are retards who 1) either never heard of the disease before, because they lack the ability/desire to read, or who 2) knew of the disease but were basically lazy dumbasses who lacked the foresight to have the medicine onhand to treat it, and further lacked the wherewithal to simply make an overnight online purchase to have the right meds delivered in time.
Therefore, to be honest, this question smacks more of rabble-rousing inflammatory rhetoric than anything realistic. Maybe back in 1998 I can see this question being posed, when dogmen were first learning of this problem and had no clue.
But today, with all the information that's out there ... and that has BEEN out there for nearly 2 decades ... I honestly can't imagine any competent, knowledgeable dogman in this day and age not having the meds onhand to deal with this (ultimately) very trivial parasite ... or not being able to get ahold of the meds through his contacts within 24 hours. There is simply is no (what I would consider to be) seriously competent dogman who hasn't dealt with this problem many times, and who doesn't know the symptoms/how to handle it effectively immediately.
Jack