@Dajory:
My personal problem with this feature is not that it is not historically correct.
I am also not afraid of generally adding controversial aspects since we also added "Slaves" which was heavily discussed.
But generally
personal tastes are really different.
I perfectly accept your personal taste and your opinion though.
But for me, this is a
pointless feature that does
not add fun and
almost is an exploit.
(Currently I am the team member volunteering to implement most of the features because the other members work deeper in the code.)
I am simply not interested to invest the effort.

And even if another team member would want to do it, I still do not like it and would most likely say "no".
(All other team members have that right as well.)
Every community member can make suggestions and discuss them.

But the team members can still refuse them. (And only features with a "team consense" will be implemented.)
We also agreed though that we (the team) will not force features into the mod if community majority does not want it.
So it is nothing personal. We simply have a different personal taste.

I am just telling you
honestly that there is almost no chance that "Purposely contaminating Natives" will be implemented in WTP core mod.
(But of course every modder creating a mod-mod can implement whatever he wants.)