What's the right thing? Wasn't the right thing to have forthrightly denounced the group to which the murderer belonged first, and unequivocally, and then turned to the general tenor of hate on all sides?
Coming out in full support of Trump's weenie-ish response is not the only "right" alternative. It involves taking a lot of heat and most people won't take the heat for someone who has either already pissed on them, or who is likely to do so in the near future.
If Trump wanted that sort of support, he should have built up the political capital necessary to afford it.
Trump's response was on target and it was brave and not at all weenie-ish, as you so elegantly call it.
He did not take the easy way out and jump on the approved group of haters but acknowledged that there are two sides.
As for the driver of the car, that is obviously horrible but hardly the first time an idiot has driven a car into people and hardly the first murder committed lately if you count the cops who have been ambushed and shot.
Trump should not have to suck up to fellow Republicans in order to expect support from them when he is right and he was right this time.