I would say a good argument for communism is the worsening side effects of capitalism. These problems simply cannot be fixed in a capitalist framework because they require global cooperation and capitalism is based on competition. Problems like over exploitation of natural resources (overfishing, carbon emissions) and the failure of the market to adequately provide services for which there is a fixed level of demand (housing, education, healthcare. The scale of college and medical debt is getting ridiculous). Many other problems like these.

The solution is more democracy and yes common ownership of the means of production. People are just allergic to the specific term of class struggle. but it doesn't change the meaning - the ownership/ruling class benefits from the status quo even as everything gets worse. They will not give up control without a fight, and as you said they will use every tool, from propaganda and legislation up to direct violence to maintain that control.

Like it or not, automation is going to lead to the end of capitalism when the majority of jobs we have today are rendered obsolete and the unemployed masses are forced to subsist through some sort of UBI.

Automation has been going on since the dawn of the industrial revolution. You see a robot doing a job a person used to do and get excited and think it's going to be the end of the need for labour.

But look at an a excavator. People used to have to dig everything with shovels. But an excavator can do the job of hundreds of people with shovels. Excavators have been around a long time, but didn't lead the elimination of all work everywhere.

Yes, "the majority of jobs we have today" will be made obsolete just like how having a big crew of strong people to dig a canal (or whatever) was made obsolete. But then there were new jobs to replace those ones.