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Rebelling early gives you an immediate talking point when you'd otherwise be irrelevant.
Doing it now allows you to be brought back in, which both gives a second talking point down the line, as well as more time back in the party before the next election. That way you get max use of the party machine for your re-election.
You're not going to get coverage for just sitting on the sidelines watching the government initiate a general poverty review.
Voting for the SNP motion feels like Showboating to me. What have they achieved by doing this?
Other than greatly reducing any influnce they might of had on the decision. To rebel so early on feels like a waste to me.