When Aaron and his sons have finished covering the sanctuary and all its furniture, as the camp sets out, after all that [is done, but not before], the sons of Kohath shall come to carry them [using the poles], so that they do not touch the holy things, and die. These are the things in the Tent of Meeting (tabernacle) which the sons of Kohath are to carry. Numbers 4:15
A vital spiritual principle is to do exactly as God commands and be attentive not to follow our own human reasoning or water down His laws, commandments and instructions. Following our own ways apart from God may end in premature death (Proverbs 14:12).
People will almost always look at things from a human perspective. Seldom will they view things from a spiritual perspective. What seems right from a human viewpoint is not what God teaches sometimes. Sometimes the rules and instructions from God make no sense at all, or they just don’t seem fair.
Saying that it can kill you may not always mean sudden, physical death (in this case it does) . But it always starts you on the slippery slope to separation from God. Unless you deal with whatever is unacceptable in your worship of a holy God, then long before we die physically we experience a lot of other deaths. We experience a host of little deaths, as one-act of unacceptable worship after another without repentance leads us further and further away from the abundant life God created us for, further and further away from our source of life in God the Father, the Son, and the Holy Spirit.