Why does the Catholic Church consider protestant baptisms valid sacraments, but not protestant marriages?

Inspired by GratefulDisciple's comment under Geremia's answer https://christianity.stackexchange.com/questions/90361/multiple-marriages-and-divorces The Catechism says: > The ordinary ministers of baptism are the bishop and priest and, in the Latin Church, also the deacon. In case of necessity, anyone, *even a non-baptized person*, with the **required intention**, can baptize by using the Trinitarian baptismal formula. The intention required is to will to do what the Church does when she baptizes. The Church finds the reason for this possibility in the universal saving will of God and the necessity of baptism for salvation. (CCC 1256) The *Directory for the Application of Principles and Norms on Ecumenism* says: > a) Baptism by immersion, or by pouring, together with the Trinitarian formula is, of itself, valid. Therefore, if the rituals, liturgical books or established customs of a Church or ecclesial Community prescribe either of these ways of baptism, the sacrament is to be considered valid unless there are serious reasons for doubting that the minister has observed the regulations of hisher own Community or Church > > b) The minister's insufficient faith concerning baptism never of itself makes baptism invalid. Sufficient intention in a minister who baptizes is to be presumed, unless there is serious ground for doubting that the minister intended to do what the Church does. However, as Geremia pointed out, > Can. 1108 §1. Only those marriages are **valid** which are contracted before the local ordinary, pastor, or a priest or deacon delegated by either of them, who assist, and before two witnesses according to the rules expressed in the following canons and without prejudice to the exceptions mentioned in cann. 144, 1112, §1, 1116, and 1127, §§1-2. Why is it that sacramental baptisms are possible for non-Catholics, but not sacramental marriages?