While they may name Sanders as their focus, it is any Progressive that they oppose. They are trying to suppress Tulsi FAR more than Bernie because she is so far to the left of Bernie.
Here’s the problem with what you have stated. Sanders himself is still propagating Russiagate. Look up his statement from 1/14/2020.
Then look up his statement that “It is the role of the US president to rebuild the UN.”
Then REALLY read his foreign policy page. Explain to me what is meant by “pro-democracy FORCES”. Why is “force” a word in that sentence? There are thousands of other options available, yet he consciously chose to use “force”. BTW, who decides who is “pro-democracy” and by what criteria? Sanders has already called Putin, Maduro, Chavez and Assad “dictators”. How does that lend itself to diplomacy?
Tulsi also said she would pardon Assange, Manning and Snowden. Try and find any equivalent to that coming from Sanders. You won’t find it because it’s not there.
You can support who you want to support, obviously. Just do so with eyes wide open. Be honest with yourself about how Progressive your candidate is. Because by extension, it defines how Progressive YOU are in reality.