A problem is that of "Americans" who are really foreigners in their basic ideology. Many liberals want to eliminate any vow of fidelity in naturalization ceremonies, as they themselves seek to overthrow the Constitutional government, even if little by little.
A vow, in today’s world, doesn’t mean much.
Anybody sincerely devoted to overthrow of our government wouldn’t balk at lying.
The problems in our country have very little to do with disloyal naturalized citizens. Most of our problems arise from disloyal but impeccably natural-born citizens.