A better leader would have known how to read the room and realized exactly how little support he would have for this action.
Precisely.
Putin is a mediocre former KGB
colonel lieutenant colonel (edit: Mr Putin did not make colonel in the KGB) and these characters are not known for being particularly smart.
Putin lost control of the narrative even before the invasion started and bet everything on immediate collapse of Ukrainian military capabilities, which was very unlikely to happen.
Now there are reports of Ukrainians taking up arms in support of the Ukrainian military in large numbers - particularly in Kyiv.
It is well known that the Russian military does not do well in city combat (I mean who does, but the Russians may be the worst).
As their initial foray into Kyiv was repelled, a destructive attack on the city with artillery etc. becomes a distinct possibility and that could justifiably be called a genocidal attack.
No one who takes part in or supports such an operation can avoid responsibilty and ultimately accountability for crimes committed - and that is true for the Russian foot soldier all the way up the chain to the leadership and its agents in the west.
There are many people involved in the Russian Ukraine operation who might have to make difficult decisions about further participation in the coming hours and days.