it's the same thing with extending those tax cuts...
from a modern monetary theory standpoint, tax revenue doesn't actually matter. now, that's not to say i'm gung-ho about eliminating taxes, so much as it's to say that it doesn't actually matter if they do or not. the kind of spending programs i'd support will never be funded via taxation; that money has to get printed.
so, what's the point of increasing or decreasing taxes? it's really just virtue signalling...
i consequently don't really care if a politician wants to vote to increase or decrease taxes on the wealthy because it doesn't actually matter, so long as they're not then arguing to choke off the creation of new money; i'd rather support a candidate that wants to print lots of money and cut taxes than a candidate that wants to raise taxes and balance the budget.
it follows that if a politician can gain some leverage by supporting tax cuts that do not matter, structurally, then they should do so.