Why do potatoes and tomatoes add es and photos only add S? !

There is no clear rule for the consonant followed by o to become plural, unlike our common' animate plus es, inanimate plus S'.

For example:

Veto-veto, veto, deny; Exercise the veto power; Reasons for veto

Tomatoes, tomatoes,

Death veto, plural plus es,

It's just that in my impression, the movable type ending in O is added with es, which is a little too much.

Photos, photos, photos of him,-photos,

Some words are loanwords, which are plural and follow the rules of loanwords.