I suppose that depends on the expected reaction to either believing or not believing. In this case, from my perspective, I see two intended reactions to the claims of Russian subversion:

1) To delegitimize the President-elect 2) To foment war with Russia

I didn't vote for the guy but I don't think he's near so bad as his political opponents try to paint him. I'd like to at least give him a chance and to whatever degree he turns out to suck, I'll still blame the Clinton campaign for promoting controlled opposition 'pied pipers' rather than promoting a robust debate in the interest of the American people.

Wrt #2, I will certainly demand very strong evidence before yielding any resistance to that notion.