The main motive of Western communists and Marxists is entitlement
To start things off, I am mostly right-wing but do have a few left-wing views, especially regarding indigenous issues, climate change, and the environment. I have a BS.
I was born in the Philippines. It was not a communist nation, unlike Poland, Czechia, Hungary, etc., but it does have communist rebel groups that my parents are aware of. They also have the same problem of some college students who are being radicalized into communism, just like what we are now seeing in the U.S.A., the UK, Australia, and New Zealand, where we now live.
My parents know that communism and Marxism don't work in practice. Same for my close friends (who are also right-wing). I really cannot understand why so many university students, instead of focusing on their studies and being willing to debate respectfully and respect different views, are entertaining and glorifying an ideology that has killed 150 million people. And in my experience, they are much more judgmental and willing to shut people up than their political rivals.
The current systems here in the West are not perfect; they have many aspects that require improvement, but one thing is for certain: they offer much more than 80 to 90 percent of what other countries on Earth can offer their citizens. The people in the West have essentially won the birth lottery and have things that other human beings are praying for, like relative safety, healthcare, education, jobs, clean landscapes, stability, etc.
Yet I see the Marxists and communists complaining that Western systems and entities are inherently corrupt or irredeemably evil, built on things like capitalism, patriarchy, oppressive religion, etc., often to the point of wanting to radically tear down the system and replace it with something often forced. Yes, there were legitimate historical grievances, but most of us have moved on and are focusing on the future. We give you so much more than the rest of the world, and this is how they treat us? By constantly complaining, wanting the system to be destroyed, wanting to replace its moral foundations, and even preferring more oppressive systems in other countries (especially recently).
So, I think that the main motive behind Western Marxists and communists, who have not seen how the system cannot work in practice (as in Eastern Europe), is not really about benefitting others in their communities, but entitlement, more precisely, "I want what I want, when I want."
These people are not content with simply finishing their degree, having their family clap at their graduation ceremony, and working hard for a few years to achieve their goals. They want it now: lots of money, a fancy car, a nice house, people looking up to them as a moral hero, and remembering them as being on the "right side of history". And so, when even a mainstream left-wing labor government (i.e., Liberal/NDP in Canada, Labour in the UK and New Zealand, Labor in Australia) can't give them that (because really the world can't), they get angry at the system that gives them the rights to protest, disagree with the government, be safe, etc., and long to destroy it. It is nothing more than a tantrum.
They should be looking at themselves and deciding whether something may not be right for them, or whether they can't have it now and should work hard and wait a few years, rather than blaming or trying to tear down the system. And that is the tragedy: these people don't know real oppression. They want what they don't know is actual oppression, to satisfy their desires for having what they want, when they want. The things they take for granted, millions around the world would pray for.
Oppression only exists in the mind. My parents had the most poverty among their friends growing up, but they worked hard and now live a comfortable life in a first-world nation. So I don't like hearing people blaming everything else for their problems.