I didn't suggest anything about your voting preferences, I used an example from the last Labour government and made the point that the country wasn't, quite rightly IMO, holding Blair voters to account. Yes I do think you form part of a vitriolic group of authoritarians who think they have a right to demand everyone is accountable to them personally for their voting choice. I didn't vote for the Conservatives is 2019 (never have yet) but have managed not to spend the last two and a half years calling those who did stupid. I have the maturity to understand that not everyone sees the world the way that I do. It's democracy, you don't always get what you want.
You say the Conservatives "hoodwinked" the electorate in 2019, I think they stated what they stood for and people preferred what they were offering. Labour, the only realistically viable alternative, campaigned on a fantasy manifesto and a party riven with division. Their core voter base was sacrificed to identity politics. The day after the election they did not look to see where they had gone wrong, they concentrated on where the electorate had gone wrong: conclusion, voters were stupid. It's really not the way to persuade voters you have any respect for them or their concerns.
Whilst the morals and integrity of Johnson are questionable, to make the understatement of the century, the electorate voted for the party and its policies which they clearly preferred to Labours offering. Some people may think their vote was a mistake and others will be glad it wasn't Labour in charge throughout the pandemic. Why would you assume people votes are a mistake?
The voting booth is indeed a private matter, the accumulative results of every election affect us all, it is not unique to 2019 so unless you are suggesting we ban everyone you consider to be a fool from voting there is always a chance you will be disappointed. Your vote is no more or less important than anyone elses.