Normally i would say that's fair and he should be given a chance to prove himself, actions speak louder than words etc.
The problem is not just the fact he got elected, it's the context he get elected in. There is a lot of unrest, discontent and steadily increasing polarization over there, in other words the US are not doing very well at the moment. If things had been going smoothly over there, people would have laughed at the very idea that he would run for president, but he rode on a wave of anger and hatred and now it has taken him straight to the white house.
Already we have seen numerous reports of ethnic and religions minorities getting abuse flung at them. The fact that the fecking president is in no small way responsible for the actions of this mob of degenerates is just mind boggling. The president in indirectly responsible for hate crimes
ISIS was also "celebrating" his election and it's quite obvious why. The rhetoric he used against Muslims not only served to engage the bible thumping rednecks, it's also perfect for the terrorist groups, because they feed on shite like this. Even the slightest provocation from a terror organization and all hell is going to break lose.
Him being president not only concerns the US, it's going to affect the whole world as well. Just the fact that he is POTUS gives him, regardless of him deserving it or not, gravitas and a big say in the space of world politics. Hes already appointed climate denier no#1 as head of EPT(?) so that's the Paris agreement down the drain. Who knows what kind of daft schemes he is going to cobble up as international politics, but considering he is surrounding himself with blowhards like Christie, Gingrich and Giuliani i think it's safe to say there will be a lot more burning of bridges than building them