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OK take a read of this
https://en.m.wikipedia.org/wiki/Mass_killings_under_communist_regimes
110 million killed in Soviet Union from 1900 onward. And that's just one regime.
Those killings were made possible due to an ideology, just as the millions of killings under the Nazis were.
If the ideology allows these heinous things to take place (whether because it's a flawed system or flawed people exploit a system) then I don't think anyone should be proud to associate themselves to it.
If you are drawing an equivalence with your lone libertarian murderer then I find that a poor argument.
Bainbridge-
It's a fair point that people used the ideology as an excuse, but communism as an idea didn't cause those killings. At it's heart communism is about equality, all people being equal, the fact that there has been genocides in it's name doesn't change this. Whereas a nationalist ideology like Nazism is very much about one group of people being more important than others. That's why they can never be equivalents.
Sumo
So if someone says "I'm a libertarian" then murders someone, that means all people that identify as libertarians also want to murder people?