The problem with this is the many, many continued examples of slippery slopes.
Before Australia conducted their gun confiscation program, they implemented mass registration. In Britain, some retailers require a purchaser to produce proof of age to purchase a knife (because knife incidents spiked after guns were removed). There's a movement there to collect / ban all 'pointy' knives.
The most logical way to compromise would be to both strengthen the right to purchase and own firearms, while simultaneously requiring registration and proof of ability to safely operate that firearm. It would really need an amendment to the constitution, clarifying both the rights and the power to license and require training. Unlike cars, weapons are a constitutional right in this country.
But that is not the objective of organizations trying to place laws on gun ownership. I've read many left-side articles which essentially state a tactic of '
do what we can, when we can, until we can eventually get a ban' (that's a link to such an article).
In the face of those manipulative tactics and stated intent to follow the slippery slope path, there should be no question as to why gun advocates / supporters / lobbyists don't bend and fight every and all moves on gun control.