People will always be daft enough. You've said yourself that you've voted Tory in the past because you didn't really pay any attention. There will still be plenty of people like that, as well as people who think they'll somehow benefit from backing the schoolyard bully. It's human nature.
People will be daft enough, but there's a scale to it, like I say, people are daft, but not many that daft, not for this scenario/ circumstance.
I've voted for them previously as a one-off (a much tamer version of this lot), when I was much younger and not that interested. Wasn't based on any far-right reasons really, purely economical and maybe some reasons to do with defence (which was my sector). It doesn't take much to move back the other way, I should know. I realised almost straight away, and have moved further from them ever since. How they are now is far worse than at any point I've know. I suppose being in the centre/ centre left, and having worked in two different sectors which are rammed with right-leaning people who are not earning much, I've got a fair feel of what the current mood is with swing voters.
It's quite easy to forecast which direction the middle is going, and understand reasons for boosts for Labour and Tories, and also see which boosts are papering over the cracks (canyons). I was talking about the tories getting beat in 2025 back during the vaccine rollout, where the labour left were on Starmers back for Labour being behind in the polls. They're not talking about the polls now though.
The tories need some absolutely massive good news, better than any other good new in the last 70 years. The good news would almost need to be equivalent to how bad covid, NHS, public services, strikes, the war, energy prices and inflation have been bad, it's not happening. If Labour lock in ~400 seats, then that will probably be enough for two terms, where they will have some time to do some good. The first 5 years aren't going to be pretty though, it's going to be a tall order digging out of this hole. I just hope the left don't expect everything immediately and start kicking off, as it will pull the rug before we've even started to get anywhere, and invite the Tories in for another 10-15 years. I imagine by then they will be calling themselves the "new conservatives", and be doing all they can to get away what has happened in this term.
Backing the bully can work, as a short-term tactic in a desperate scenario, or not being against him anyway. Sort of like how not causing aggro for kidnappers can work, it can help you by them letting their guard down, the military adopt similar tactics sometimes, giving up just enough to stay alive, but nothing really worthwhile, which is time sensitive. Long term it doesn't work though, and wouldn't be advisable short term if there were other options.