Question

I’m a bit torn.
On the one hand, the strength of democracy is that anyone can be elected, even if he can’t read or write, and that’s the power of an elected representative: there is representation even for ignoramuses, drunkards, and even thieves and corrupt people…
 
But sometimes it seems excessive.
For example, a member of Knesset from the governing coalition shouting at a man appointed to a ministerial post that she can smell vodka on him…
and he (as noted, serving as a minister in the government) replies that she is invited to come and smell his mouth…
Is there any limit to what is appropriate?
Where and when should a voter decide that there is a line, and that there are people who simply cannot be chosen to stand at the head of the nation?
 
P.S. In fairness I should note that at the moment this has no practical relevance for me, and it is obvious to me that as long as someone indicted for bribery, fraud, and breach of trust is at the head of that party, I won’t vote for it. But the question is after he is removed, or on the principled level.