a good man to manipulate

[azz]

Are these sentences correct:

1) He's looking for weak people to bully.
2) They have found a kind person to manipulate.

3) They are looking for harmful weeds to eliminate.
4) They think they have found a bad worker to fire. I'm sure they'll fire that poor guy.

5) They have found a good man to manipulate.

[Alan]

All possible...