I'm not personally against usage of drones in some totally general way, but we should keep in mind why the Bush to Obama shift was made. Aside from the technology simply maturing and growing more viable, we went away from having teams of special operators apprehend terrorism suspects in surgical snatch and grab operations and toward just murdering them with drones for two basic reasons.

One, surgical snatch and grab operations sometimes result in high profile failures where US operators are themselves captured or die in the process, which becomes a huge local media sensation. Two, when you arrest people, you run into the issue of what to do with them. Hence, all of the continuing problems with Guantanamo. Do you give them rights? Transfer them to regular prisons? Release them? Hold an actual trial at some point? We still haven't figured it out, and the easiest answer is just stop arresting people and kill them instead.

I leave it to you to decide which of the two options is more ethical, but the reasons we did it have nothing to do with ethics. And drones are inherently less precise and also kill whoever happens to be nearby a lot more often than Seal Team Six.