The constitution doesn’t grant many extremely important rights – including the right to vote – because it was written by slave owners who didn’t want to grant those rights to slaves and women.
If they did add those things, they would have had to explicitly state those rights were for white men only.
I assume if they had, all the pro-gun people saying “we need to arm mass shooters and idiots because its in the constitution” would also be pro-slavery and anti-suffrage too, since they staunchly oppose changing the constitution no matter how backwards and immoral it may be.