Because we aren't trying to win an argument here. It isn't about being in the right or winning, it is about successfully running a country.

The Right, particularly the "Freedom" Caucus goons, are specifically opposed to successfully running a country. They resent the very existence of government intervening on behalf of people at the expense of their donors. It is impossible to successfully run a country if you give those people veto power over the legislative process. They are here to engage in sabotage, not progress.

That still doesn't answer the question of why the Right isn't blamed for not reaching out to the Left. And given that they're the ones in power, it's their responsibility to do the reaching out.

The democrats just need to move even further right than their current neoliberal catering exclusively to donors platform.

That would close the gap.