I don’t have confidence in any majority government. The elected party doing as they want and ignoring part of the electorate is a failure of democracy. Every motion should be evaluated on its merit, not through agreements of party support. In that sense, the likelihood of a majority Conservative after an election would be a bad thing.
Sadly, longer jail time is purely placebo. Plenty of studies show jail time has no incidence on crime rate. Sure, locking people for longer would delay recidivism, but we could do better than that.
It’s not about logic though. Longer jail time proponents do lean on the emotional argument of a few anecdotal cases or recidivism. This tend to make flashy headlines and stick with the population.