We can survive the "attacks" by one candidate on another

The media is having a field day suggesting that the in-fighting among Democratic candidates is harming our chances of defeating Trump.
Well, they have ridiculously short memories. At this point in the Republican primaries in 2016, Trump, Cruz, Rubio, Kasich, Bush, et al were attacking each other left and right, often far more viciously than anything that has come from any of the Democratic candidates this campaign season. Indeed, the infighting among Republicans in 2016 continued into the spring. Yet it didn't destroy Trump's candidacy.

The infighting among Democrats in February won't matter in the end so long as Democrats close ranks behind whomever gets the nomination.