Most important is that it is also not up to the nation of Israel whether or not to follow the most supreme and overruling of all hebrew Laws: The Ten Commandments.. they, as mere men, do not have the power to overrule the Supreme and Unfathomable Yahweh's most potent Commandments with ad-libbing..
Think of it this way. The Ten Commandments are like the US Constitution, but different in that they can never be amended, nor abolished.
All lesser laws are tried against them and if they fail to adhere to The Big Ten, then they are against the Will of Yahweh and there for grounds for condemnation.
Yahweh is greater than the simple and often stupid customs and affairs of men. This is why The Ten Commandments were made. Yahweh (God) realized that men ad-lib, fudge and "redact" according to wanting to get out of the Contract. So that's why they are The Big Ten...immutable, unchangeable, Supreme and Overruling. God knows times can change the souls of men. And these are the edicts that may not be compromised.
No way around it....if you're a jew and killing on the Sabbath, for any reason or no reason at all.. you are in BIG BIG BIG Trouble, with a capital "T".