Millions are already miserable on the slim chance that they'll overcome the people with all the guns and power and retain their sovereignty and freedom (i.e., Ukraine if that wasn't clear).
I just would not intentionally target the _common_ Russian people as much as it can be avoided. Hurt the oligarchs, Putin, anyone who is actually helping him, etc.
It won't be painless for the common Russian people, and we can't really help that. But targetting them is just hurtful for no benefit.
It's absolutely a last resort, but this is the highest stakes game in existence and there is no time to mess around.