“Making martyrs won’t win much.”
This is correct. The two biggest hopes of Ukraine are the USA joining the fight or the Russians turning against Putin. Killing civilians inside Russia proper is the wrong way to turn the Russian people against Putin.
Your think Russia won’t launch nukes; You think Russia politicians are like American politicians who would just sabre rattle and bluster then capitulate when foreign armies come to their boarders. Your thinking will get us all killed. For what what? To defend so called democracy in Ukraine? What a waste.