If you mean an Immune escape that is not a real problem for rabies because that virus has a slow evolution as you can tell from the fact that the same vaccines that were used in the 80s are still used today. Compare that for example to flu or Covid-19 vaccines where even two year old vaccine types are considered outdated and not used anymore.
Do you know how many parties had members in the parliament of the Weimar Republic when Hitler was named Chancellor?
I learned in school – not sure if this part is entirely accurate but its an interesting idea anyway – that this situation was precisely why there is a ~5% of votes, lower barrier for parties sending representatives in many modern European democracies.
https://en.wikipedia.org/wiki/Electoral_threshold