It is not + noun + to infinitive
Solution 1:
It is not good / a wise decision [to kill him here].
Your example is acceptable, but the infinitival clause does not modify "good" or "wise decision". This is a subject extraposition construction where the subordinate clause is an extraposed subject, outside the verb phrase.
The non-extraposed equivalent would be:
[To kill him here] is not good / a wise decision.
Here, the infinitival clause is not a modifier, but subject of the sentence.
The same applies to your other examples.