It’s really bad to support specific policies just because they sound like a kind of policy that you broadly support. I personally broadly support pro-density policies. But many specific policies that are proposed either have fatal flaws or are useless as long as a century worth of accumulated NIMBY policies exist that super-redundantly ban the sort of density increase that would actually be useful.
And to be clear, only allowing density increases without cars would be exactly the sort of nonsense restriction that would be a fatal flaw, at least in the US.