They are right, of course. If you want to be emotionless about it, the more we spend and the quicker we do so, the less this war will cost in total. If you want to be humane, then the suffering of the innocent party in this war is worth the cost.
We can ignore the nuclear threat, because China. Any other threat of escalation is meaningless. Russia will use its conventional resources regardless of what we do.
The poll isn't a balanced one. But it does show that Dems remain behind Biden in this matter.