A) Are you playing in a cover band?
B) Are you trying to make a living playing music? Not just hoping it happens, but making it happen?
If the answer is "no" to those questions, then I don't expect you to understand. The show is what people are paying to see...they don't care about what's sequenced and what isn't, until the band blows the illusion by being completely incompetent without their backing tracks.
Remember, Milli Vanilli tried to pass themselves off as something they weren't; they were lip syncing and dancing...cover bands are playing instruments, singing, dancing, and using tracks to fill out the sound. It's a different experience, and far from a CD. Live energy comes through regardless of track usage, unless the live energy isn't there in the first place; in which case, no one wants to see a band regardless of who is, or isn't, playing what.
Musicians' good opinions don't pay my bills; club owners seeing my band pack a dance floor do. I'm sorry you don't see the difference between hard-working musicians making a living and a CD; my paying audience members do, fortunately. Should I assume that worship bands using backing tracks aren't worshiping God by your definition, then? Money isn't the only justification for backing tracks, it's simply a measure of success in giving an audience what they want.
And, incidentally, calling any band's years of rehearsal, blood, sweat, tears, struggles, practice and mastery of their instruments, and the work they put in to making sure that their audience members have a great concert experience to dance, a "karaoke" act, could be taken as one hell of an insult. If you don't like a certain style or trend in the music industry, that's certainly your perogative. Belittling what others do for a living, and writing them off as "hacks" is a different thing entirely.