If he disposed of it, people would have found a way to bring him back. It was "safer" for him to be sealed away. I highly doubt that he expected anything close to as the will of a Goddess, that was considered a myth, to pop out of nowhere and that Madara has already set a technique to reveal himself.Even further than that. It's Tobirama's fault for not appropriately disposing Madara's body as well as fueling the hatred of the Uchihas.
Without Madara Black Zetsu wouldn't have anyone powerful enough to turn to or anyone with a Rinnegan for that matter. Nagato would have been offed when they were attacked by Hanzo or sooner and that would have been the end of Akatsuki, and Obito would have died from his injuries. The plan to reawaken the Juubi or IT plan would have ceased and the destruction of Konoha would have been prevented. Furthermore, Tobirama created Edo Tensei and not only did it brought forth the War along with bringing back Madara, it reawakened Kaguya.
He gave the Uchiha the Police Force, to keep the peace in the village, and they thought he was suppressing them by doing so. The Uchiha were their own worst enemies. . . none stop.
Tobirama was indeed the creator of the Impure World Reincarnation, but he is not responsible for it's misuse. That's like saying Hashirama is responsible for almost every death in the Fourth Ninja World War, because his DNA was used to cultivate the Zetus'. Also, the technique was listed as forbidden one to use.
The Impure World Reincarnation technique was created to wipe out the map clean, along with it's caster:
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People just remember what was said about Tobirama before he was reincarnated and what he said after wards.
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