Yes, I'm not ashamed to say that I think a party that backs a genocide, bombs children, and screws over it's voting base is not doing good enough. Especially when they seem to have plenty of time to help out the other party, and their corporate doners.
They've had plenty of time and opportunity to fix plenty of things, but chose not to. You keep saying that they "only" had 2 years, but I saw them waste those years.
You are also correct: I will never show up for a party that wants to bomb children, or picks a rapist as their candidate, or backs a genocide, or continuously caters to the rich instead of their voters. Why would I support a party that fights against what I want?
edit: Also, when have the Democrats catered to the left? I see them consistently run to the right, but I usually only see them "cater to the left" verbally, on stage when they want votes. Once elected in, they immediately turn back to the right.