That is what sanctions do, so either no politician has ever thought about the implication of sanctions or it's an intended effect.
1. They don't think about these kinds of second-order effects. They see that this company is somehow involved with the government and that's it. Their electorate won't care about these kinds of details because they're "doing something" to supposedly stop the war sooner.
2. They think that Russians would somehow revolt against the government. This doesn't work — the Russian government lacks any meaningful feedback mechanisms. By protesting, you'd expose yourself to immense personal risks for no discernible effect. Unless you're a heavily armed private army heading straight for Moscow.