Good scissors actually work either way. Blade-wise, that is, not when it comes to moulded handles: With proper blade geometry you do not need lateral pressure from the fingers for them to cut instead of passing each other, and even the exact "wrong" type of lateral pressure works fine. Scissor blades should only ever be loose when the scissors are opened impractically far to cut with. Don't need to be expensive, only need to be not cheap.

Those chairs should be outlawed for a whole lot of reasons, not just that they're ignoring lefties.

Note on handwriting, btw: Ball points are a bad habit if you want to develop proper technique, it's very easy to use too much force, cramp up, etc, even without noticing. Over here kids write with pencils until they have the dexterity to move on to fountain pens: Breaking a pencil tip and having to resharpen is just the right amount of annoying to develop good habits.