- a theoretical economic model that is opposed to capitalism

- the atrocious regimes of the 20th century calling themselves communism you are referring to that have vanishingly few things to do with the first.

Vanishingly few people in Western Europe support these atrocious regimes. And therefore, communism the way you are using it. What's more, there's not much propaganda for communism here (I believe there was propaganda in the past, though). The confusion is usually here and people mostly don't see communism with a good eye because of the confusion (or because they are knowledgeable and oppose the theory - which is a better reason to be against it). Now, it's true that we have weaker feelings about it than in the US (and, I guess, the parts of the words that suffered from the atrocious regimes).

(The usual response to this is that theoretical communism invariably leads to these atrocious regimes, but I believe we don't know this - invariably, it seems they've been set up by possibly sadist assholes with huge egos and thirsts for power, we haven't tried without - as well as we don't know if it would work. I don't have any further useful point to make in this discussion so I probably won't engage in it.)