In times of rampant inequality and growing economic anxiety, radical solutions become far more appealing to the desperate. While your point isn't far off, those propping up the current system need to actually "to fix what we have and try to be better".

For instance, will those who support capitalism as it is be willing to support for massive estate taxes? Increase the social safety net? Push for greater access to quality education? Otherwise then it just perpetuates the "there is no alternative" narrative that keeps the status quo as it is.