I don't want to start any flame wars
Yes, I very much hope we can avoid this here.
Difficult, as this is a case where unfortunately there is no way around politics and specific politicians when wanting to talk about investing.

I no longer think it's honourable for me to invest in the US
Though I understand that: Isn't that a typical case for Warren's "Only invest in companies that are so great that they survive it when managed by idiots --- because at some point in time that will happen"?

(I don't remember the exact words, but think that was roughly it's meaning.)

In other words: As a European outsider I suspect that probably not only many voters already regret their vote, but that additionally the really powerful politicians of his own party don't stand behind their leader --- with the result, that the worst disruptions will be temporary only, will be reversed by the next government, no matter which of the two parties will be then in power.

(I tried to formulate that as politically neutral as possible, hoping we can leave our political/ideological opinions out of this as much as possible.)