I think that’s a little unfair: MOST political decisions are still taken for the good of the country, regardless of effect. But there is certainly an extent to which political point-scoring plays a big role.
Cameron was, for me, a fantastic PM, but he will unfortunately be remembered for this mistake.
Just a small point — the Conservative party has only really been divided for 25 years over Europe, as their problems stem from the political oversight of the EU, rather than the economic element which was the focus of the EC that preceded it.
I also think it highly unlikely that the Tories will remain divided, as negotiations after we leave, as well as the test of time disproving their arguments against May’s deal, should content them. Within the foreseeable future there will be a low point, but I think that, from then on, our politics and economy will improve.