Yes they have. I used to be a bit naive about Israel. I have been there twice, and lived there for a year. Was a long time ago but I have a strong emotional connection to it. Some of my (distant) relatives live there too.
I speak Hebrew too.
Anyway, long story short, I would call myself a would-be Zionist - would be in the sense that I don't see an issue with there being a primarily Jewish state, but not in the actualisation of it and what it has become.
Zionism, from my point of view was is just a word to identify oneself as believing in the right for Jewish self-determination, just not at anyone else's expense.
It is hard to articulate this point of view without the fear that I'm going to be met with an onslaught of messages from those who are understandably angry, as the term 'Zionism' has now become anathema
But I certainly no longer perceive Israel in a positive light whatseover. It has made me feel obligated to perform a 'mitzvah' and donate to causes to help Gazans, which is not something I would have done without re-evaluating my own beliefs.