It is a complex topic and my own views are still being defined, but I think it is safe to say that for most the issue isnt capitalism, it is unchecked capitalism. The idea that we work for the system instead of the system working for us.
My grandparents saw our country mobilize for war and create liberty ships. The country was in the space race - I've seen an article (Popular Mechanics) from 1950 that thought we would not yet have landed people on the moon by 2000, but despite that reasonable expectation, they did it. They developed national healthcare for the elderly and the poor, the built the foundation of modern retirement. They crisscrossed America with interstate highways.
But me? I've seen every notable problem rejected without an attempt at solutions because "how will we pay for it?" I've seen seen infrastructure systems left to rot and crumble because of the national debt, yet somehow each time a tax cut comes up for the rich they sell the idea that THIS time it will improve things for the non-rich. I've seen education budgets gutted, healthcare systems dropped and ignored, and I've seen science regarding the global climate scoffed at because their "gut" doesnt agree. (The location of their gut seems to coincide with the location of their wallet)
I've seen our representational democracy have clear signs of distress, from gerrymandering to foreign influence, for DECADES, not just recent headlines.
I've seen wages be near-flat for almost the entire lives of people now old enough to vote or fight in wars, but that wage issue doesnt seem to apply to those with enough money to start with.
But addressing any of these issues might threaten those with money, and our worship of capitalism has lead us to conclude they should be obeyed.
Capitalism is very effective, but we've stopped using it because it is effective, and are instead being used by it. We've gone from a system that allows the worthy to find financial success to assuming that financial success means you are worthy (as lack of financial success means you are not worthy).
Capitalism isnt the problem, but our relationship with it IS.