I think you're selling humanity short. There are plenty of ways to have society prioritize researching drug therapies for different diseases that don't hinge on reaping massive profit on the sales of the drug. See: public funding. I don't necessarily mean that through government/taxes, but it should certainly be an option.
This is incorrect. And you're making the same mistake as the one you point out in your next sentence. Using an euphemism to simplify a complex ethical question (possibly incorrectly).
According to this [1] theft involves a component of denying another person with rightful possession of that property its use. When dealing with ideas (and software, algorithms, math etc., etc.) we're dealing with new ethical questions that we shouldn't hurry up and sweep under the carpet by pigeonholing into our previously inadequate understanding of ethics. Doubly so when it deals with life and death as in the case of drug patents.
But without the incentive to invest in the huge cost involved with discovering drugs, you will have nothing to look at the other side, glass or no glass.