A number of people who have contributed to this thread have done so in order to vilify Nicola Sturgeon by describing her as nothing but "power hungry", and equating her with the likes of the despicable and self serving Farage.
As Ewemon has pointed out, Sturgeon is not just the Scottish First Minister, but also the leader of the SNP and so it is hardly surprising that she campaigns for an Independent Scotland.
I have to assume that those who caricature Nicola Sturgeon from outside Scotland do so either because they really don't know a great deal about Nicola Sturgeon, because they simply don't understand Scottish politics, or because they just want to have a 'cheap laugh' at her or the Scottish people's expense.
Unlike a number of other politicians who have been named on this thread, Sturgeon is an extremely intelligent and thoughtful politician and political leader. Not only that, but she has a pretty uniformly high popularity with the electorate in Scotland, irrespective of the underlying political leaning of the electorate. There will obviously be exceptions to this viewpoint in Scotland, but by and large there isn't currently the same political vitriol and confrontational debate in Scotland that has beset UK politics over the last few years.
Nicola Sturgeon is well within her rights to call for a second Independence referendum. As many have already stated the last referendum was fought on the basis that Scotland (as part of the UK) was firmly in the EU, and that (according to claims from the 'Remain' campaign) Scotland would potentially lose its EU membership by voting for Independence. Furthermore, Scottish people certainly do not have an appetite to be governed by a far right Government of the sort being constructed by Theresa May and her cohorts. There is no doubt that Politics in other constituent parts of the UK has taken a lurch to the right, and this taken in conjunction with the unfortunate demise of the Labour party is likely to result in a lengthy tenure for a right wing Tory government for the foreseeable future.
Now, having said all this, I do take seriously some of the more reasonable arguments against Independence that have been made in this thread. Despite the respect that I have for Nicola Sturgeon, and the fact that I have voted tactically for the SNP in the past, I am not by nature a Nationalist. If a second referendum is called, and if Brexit negotiations go the way I expect them to go, I, along with many other Scottish residents will have a very tough decision to make about which way to vote this time round.