I live in France and many old classic 'marxianists' I know have come to despise the unread and uncultured new generation. Tell a young "marxist" what Das Kapital says of e.g. immigration and watch them decompose before your eyes... Anyway, no judgement here, just a personal observation.
Marx's view on immigration was largely that capitalists use it to pit the working class against itself, and that the nation state was a construct of capitalism. I'm curious why you think a Marxist would take an issue with that.
The problem with comunism is not that it is a faulty ideology, but that even if you tried to start a reasonable organization about it you will be overrun by mindless ideologues.
In the case of religion (whether or not I believe it is positive or negative) I know that there are many many dark corners that the "it is all about love" person is not talking about.
Same thing with comunism, I have known in my life people I would be slightly afraid to see holding power flying that banner and we all know what happened many times in history, and while this can be said of many ideology in my opinion the comunism cluster looks like it is trying to sweep the dust under the rug.
I am sure that there are a lot of people that are trying their best to rehabilitate comunism from the curse that Stalin and many many others have cast and I wish them the best of luck, but I do not think that their job is close to being done.
Having spent much of my early twenties embedded with some of today's more prominent socialist activists in the US, I can tell you that behind closed doors the only subject that ever crossed their lips was "power".
It was enough to terrify me off of such thoughts and ideals. All these years later and I still wake up in a cold sweat at night having nightmares about the people I knew getting what they wanted.
Also, would you mind to be a bit more specific about who these people are? In my experience Americans aren't particularly good at identifying what constitutes a socialist to the rest of the world.
For example for all the criticism that you can point against religion most religious communities openly and clearly oppose and denounce terrorism.
In my view comunism was never able to separate itselft from a revolutionary mindset, and so agitators and extremists were always (since Marx, at least) considered a planned and likely step.
So you talked to politicians?
Pretending to be non-ideological is disingenuous.