If getting a date is easy for many people, there is no reason it ought to be hard for others. The main reason getting a date is difficult for some is just because they do not learn how to go about it.

If getting a romantic date is easy for lots of people, there's no reason it should be hard for others.

If getting a date is easy for lots of people, there's no reason why it must be problematic for others. The main reason getting a romantic date is hard for some is merely because they do not learn how to go about it.

If getting a date is easy for many individuals, there's no reason it must be difficult for others. The reason getting a date is problematic for some is merely because they don't really know how to start it.