"The conservative party enables gun violence" and "conservatives commit the most gun violence" are completely separate and independent statements. The person you're replying to is saying the former, not the latter.

In other words, they aren't saying that Republicans commit the majority of gun violence, but that the policies championed and implemented by Republicans are responsible for gun violence occurring.

And whether or not Republicans like it, they admit this all the time, although not the way you'd think. The GOP likes to say that mental health is the driver of gun violence and mass shootings, but simultaneously, the GOP votes against improved mental healthcare and even slashes funding for it.