If I have a choice between bad and worse, I’m taking bad, what kind of lunatic would intentionally choose worse?

The vast majority of people would choose worse, at least in some situations.

Philosopher Bernard Williams proposed this thought experiment: suppose someone has rounded up a group of 20 innocent people, and says that he will kill all of them, unless you agree to kill one, in which case he’ll let the rest go. Act Utilitarianism would suggest that it is not only morally permissible, but morally obligatory to comply, which Williams saw as absurd. As an addendum, suppose the person then orders you to round up another 20 people so he can repeat the experiment with someone else, and if you don’t, he’ll have his men kill 40 instead. Congratulations, your “lesser-evilist” ideology now has you working for a psychopath and recruiting more people to work for him too.

Even the trolley problem, which liberals love to trot out to justify their positions, is not nearly as clear cut as they try to pretend it is. A follow up to the trolley problem is, is it ethical to kill an innocent person in order to harvest their organs in order to give five people lifesaving transplants? The overwhelming majority of people say no.

Act Utilitarianism is something that seems intuitive at first glance, but is very difficult to actually defend under scrutiny, and there are many, many alternative moral frameworks that reject its assumptions and conclusions. Liberals don’t seem to realize that this framework they treat as absolute and objective - that you would have to be a “lunatic” to reject - is actually a specific ideology, and one that’s not particularly popular or robust.