I don't, but you're not inspiring people to give a shit by being moral cowards (or by junking Corbyn's socialism-inspired policy agenda.)
A huge unknown is quite how popular Corbyn's policy agenda was. They definitely made a hash of selling it in 2019.
The problem with 2017 is that it is very hard to separate from the Brexit referendum, which was undoubtedly a major influence on voting intentions.
We know lots of Corbynite policies were individually popular. The problem is, we have a long history of policies that poll well but don't win elections. Analysis of the 2015 election suggests that Labour's policy platform under Milliband was significantly more popular than the Tories'. But Labour lost, and not just by a bit, but by ~37-31. I don't have a lot of objections to Corbyn's policies: I just think the man himself was unfit to run the party. I think Labour mostly lucked to a close margin in 2017 from cirucmstance, and that disguised the dysfunctional leadership that led to the 2019 car crash. I don't think the British are necessarily that right wing, but I think a lot of the English middle are scared rigid by anything that looks extreme. You can pass all sorts of "normal, safe" socialistic polices by them (higher taxes, improved social services, nationalised railways, better welfare and healthcare, etc.) but if they get the whiff of perceived extremism, they will pull down the safety shutters and hit the alarm button. Bluntly, Corbyn triggered them.
Also, I'm not sure many Americans get how slippery the Tories are. The Republicans are in a sense straightforward. You know they hate taxes, regulations, green policy, minimum wage, non-whites voting, etc. and they're very open about it. The Tories, however, are often much less clear. The Tories are quite happy to occupy Labour's territory, usually rhetorically. They constantly bang on about environmentalism, and of course do virtually nothing about it, but the mere talk gives them an angle to play with. They talk up the NHS: they effectively defund it and privatise it, but they constantly visit hospitals and say how wonderful it is.
Let's take an example. Labour started talking up the "living wage" back in ~2012. It was getting public traction. So what the Tories did was create a new minimum wage value for over-22s higher than the National Minimum Wage and called it the "National Living Wage". It is of course well short of a real living wage as progressives understand it. But it was a successful spoiler to deny Labour political territory: the Tories take credit for creating a "living wage" (that's actually not) and at the same time deny the term effective use for Labour by muddying the waters what one is. It's sort of brilliant, cynical, and morally despicable. And they do this sort of trolling and griefing
all the time. Steal a popular Labour policy, debase it and enact an ineffectual variant, move on to the next. Even now, you can hear Boris talking about "levelling up" the north and green investment jobs and all that shit, and everyone with better than middling awareness of politics knows these promises are almost certainly as hollow as they come, but it's enough to sway the attention of enough people to win votes.
How, though? The final aspect is that the Tories are perceived as the natural party of government in a way the Republicans in the USA aren't. You have two parties equally (dis)trusted to run the place. But here in Blighty, you can't really quite question why people believe the Tories should run the country, somehow. That's just what people think. It's a sort of perpetual benefit of the doubt. The Tories fuck up important things, maybe it's just events conspired against them, or it "needed" to be done because reasons, or they're really long-sighted and it will pay off 30 years down the line (i.e. when everyone's forgotten). Don't really know whether the Tories screwed up? Ah, they probably didn't or Labour would have done worse. Don't really know whether Tories or Labour are better? Well, vote Tory: that's the safe, normal, choice; the devil you know.