Again, I agree that many kinds of drums CAN be used to play melody.
The music notation used for your standard rock and roll kit explicitly defines lines on the staff as specific drums, it does NOT define specific notes. It cannot be meaningfully transcribed to a normal tonal staff. I have seen such a notation get expanded into a tonal notation for use with a drumset that included a xylaphone.
Frequently, a drummer in the midst of a long solo will choose to use rototoms, or whichever tonal intruments the drummer has included in the drum set, to play a brief melody. This is a brief interlude and stands out as very different from the rest of the solo. OK fine, drums have tonal components and are used that way here and there. The fact that the brief melodic interlude stands out as such shows that the rest is non-melodic.
Why is this so heavily argued against? Drummers are talented people who are very important to Rock, Blues, and many other forms of music. I just don’t think that rhythm without melody is music. Also, I don’t think that a standard rock drumkit is designed to produce melody. The tonal pieces of a kit are meant for special effects most of the time.
Let me reiterate that I haven’t completely defined melody yet. I haven’t thought of a good way to define it. I know that tones are involved. I don’t think that EVERY series of tones counts as melody. I have heard music where a chord progression gives a vocalist a background, I don’t think that the chord progression itself is always a melody. And sometimes the vocalist chooses to mess around with arpeggiation and such but no discernable melody emerges from all the embellishments. When a vocalist sings the national anthem (USA) these days they frequently add a LOT of embellishment, but you can usually still pick out the melody. Think about whether that last sentence made sense to you. If it did, then you know that the melody is different from rhythm, and also more than just any series of tones. Some of the tones you hear can be a part of embellishments on the melody, or just background harmonics. This all goes toward saying that you can have background harmonics, and arpeggiation, and rhythm, and still NOT have melody (and by my definition, no music). You get this with bad new age ambiant stuff sometimes.