plenty of people on these boards used to vote for SNP, or Labour, or Lib Dem, or Greens, or Tories, and have changed their minds, sometimes more than once. There's no shame in chaging one's mind. In fact I'd say it's far more sensible to do so when the evidence suggests the position has changed. Those who are still, somehow, clinging to the idea that the SNP are good, wholesome, up-and-at-em wee champions of the underdog are the ones who are utterly baffling.
At this point invoking Hanlon's Razor is the most generous I can possibly be.