By definition, any responsible individual takes responsibility of what happens for himself. The responsibility to address social problems, the responsibility to solve individual and social issues. Then, he acts on it, without blaming or without complaining (blaming and complaining is just energy waste). For example: are there poverty issues? Ok, propose solutions without blaming othersand complaining. Many organizations do so and get it successfully. Your friends need to read about Médecins Sans Frontières, Water.org, Acumen, Heifer, Grameen Bank, etc.
Sorry for this, not personal, but for me, your friends are typical examples of individuals in the second group. They are looking for who to blame -don't understand what for, perhaps to kill or imprison them-. If they believe in their ideas, they need to practice them. If they don't apply them, and they provide excuses, they don't really believe them. In such case, their discourse is not based on rationality, but on dogmas, blaming, complaining, use of excuses and personal attacks. Their discourse is evidently explained by personal frustration (causes them to point their failures elsewhere) and resentment (causes them to attack others). You can justify your position, but such kind of people will always find excuses to avoid doing what they say they believe. The arguments are as follows.
Decolonialism has failed. Deglobalization has and will always fail (maturity is not about isolation; it's not about dependence, it's not about independence: it's about interdependence). Open doors are always good, even if we don't use them; we want them to be open and use them for good. The best examples are North Korea, Cuba, Venezuela and Argentina. They reject modernity (we are not anymore there, anyway, your friends can just create their own social experiments, living like in 1700), capitalism (ask them to give the example, stop accumulating capital and share all their goods, right now!). When they pay taxes, they are supporting colonialism. Ask them to stop buying foreign products, stop paying taxes, stop using the internet, stop learning foreign languages, etc. Otherwise (if your friends don't act, dont donate their goods, don't crush their mobile phones, don't go living in communist kibbutz), those are just empt y words, which just expose their frustrations and anguish of blaming other for their own fails. Not trying to be mean here, but this is a common and predictable social pattern based on dogmas, which provides good amounts of votes to the left.
As a consequence, notice that the left wing has an ideology, but most voters are not serious about it (most don't even know it, otherwise, they would act critically about it (-see spanish Ramon Rallo's daily criticism to left wing ideas, which is impressive, he just wrote a book about the fallacies of Marxism)-): left-wing voters are serious mostly about confronting and harmharming the right wing. Just that.