The structures are designed with sufficient safety clearances and if there is no steel theft like those happening in east coast grid in sabah, the tower wont collapse.

However, general human would always see this as a hazard. Fengshui wise also not advisable.

(Engineering wise, these towers carry most probably 132kV. Any conductor carrying current will produce electromagnetic field around it.)

Not cables. They are mostly bare aluminium conductors (ACSR).