Didn't realize I posted in your duplicate thread:
Keep it focused on rights to limited natural resources. I think most people can get behind that. Why should the finite natural resources needed for human survival belong solely to one individual based on a long chain of custody originating from government appropriation in the first place and the subsequent privatization?
I'll repost Naziposter while I'm at it since he also got tricked:
The only good angle is appealing to rational self-interest. Because it's the only thing that cuts through all the BS ideology.
You're not going to convince a bunch of petite-bourgeois evangelists to embrace communism because "Jesus was socialist".
If the audience in any way has a vested interests in maintaining the system, they're just going to dismiss you outright. But if they don't, then merely remind them of their own material self-interest.
Don't just point out that they're being robbed, make them feel it.
Inspire envy and righteous indignation. Appeal to emotion. Crush peoples faith in the ability of capitalism to solve their problems, as hope in the system is one of the things that keeps people from speaking out; Remind them how their retirement plans will go unfunded, and their debts will remain unpaid, while the rich make off with billions and spend millions on luxuries they will never have.
If you're pushing for higher taxes remind them that ill-gotten wealth of the rich simply comes from them living on the workers dime. That all profits come from exploiting workers. And that there's no way that an executive or shareholder somehow works ten-thousand times as hard as their average employee.
It's not theft, because everything the rich have originally belonged to them; the workers.
If you're attacking landlords remind them that landlords do nothing. That they offer no useful service in turn for rent. Their "private property" be damned.
Denounce them as blood-sucking parasites, and point out that it's workers paid for by rents that maintain properties, while neo-feudal leeches make off with the profits.
If they then whine about how "no one will be allowed to be succesful!" remind them how all these tech billionaires weren't actually involved in the inventions that made them famous; be it Steve Jobs, or Zuckerberg, or Elon Musk, Jeff Bezos and others. And that most engineers and scientists get scraps compared to what the executives and shareholders make.
Sure it's hyperbole. But when you have the soapbox there's no room for nuance and compromise. This isn't just about capitalism; you need to make it feel as a battle between good and evil.
If you're confronted with Best Korea/Vuvuzela/Whatever; bluster and redirect. Cherry pick instead of getting caught up in Marxist jargon and theoretical specifics; most won't care. At best it will make you forgettable, at worst you will embarrass yourself on air.
Mention the successes of the Soviet Union (Space Race, elimination of famine, winning WW2), or just point at Sweden and Norway as "Socialist" countries. Hell, throw in China and how it's beating the west in various fields. Do not get pulled into this "not real socialism" crap.
Don't worry about sources - because who cares; it's all spectacle, and most anti-communist propaganda is based on feels >reals anyway. It's not like the interviewer is going to be knowledgeable enough to challenge you anyway.
And don't bother with culture wars nonsense; this is something primarily petite-bourgeois reactionaries care about. And that stuff is never a gateway to actually addressing the struggles of the working classes under capitalism. Don't even fall into the trap of engaging with it. It's irrelevant to (most) people's bottomline, and that's the only thing that should matter.