dj In the 2010 GE no party gained enough seats to form a majority government. The Tory Party had the largest number of seats and fortunately the Liberal Democrats were willing to put country before party and work with them.
There were many LibDems, including me, who would rather have gone into a coalition with Labour, but the numbers simply did not add up. Had the Tories been forced to form a minority government, they would almost certainly have called another election shortly after, and won, because they were the only party with the funds to fight another election so soon.
The Liberal Democrats believe that we should have a proportional system, and that tends to lead to coalitions.
Looking back at the way the country was governed from 2010-2015 I am sure you will find plenty to criticise, and for much of it you may blame the LibDems, but I think that most moderate people, if they are honest, now realise how much better it was than the unfettered right wing government we have had since 2015.
As for the mess we're in now, you cannot possible say whether things might have been better or worse, but going back to the subject of Nicola Sturgeon, I firmly believe that her arrogance handed the Tories victory in 2015 and this view is shared by almost everyone I know in this part of the country.