This is an instance of confusing distinct categories. It is sometimes interpreted that Luke 12:4 means one should display character and fortitude by having the courage and stamina to stand up for convictions in the face of adversity. Even granting this exegesis, it does not prohibit escaping persecution or death when it is prudent and possible to do so. If Jesus had given up his convictions to avoid death, that would be another matter, but none of the verses show this.

It doesn't require fear to get out of the way of a rolling boulder; just common sense. If the boulder is far off, and you see it coming, you don't need to be fearful to deduce, 'If I stay here, I will be crushed. It would be a good idea to move.'

John 7:1—Why did Jesus fear death and yet tell His disciples not to do so?

Problem: John informs us here that “Jesus walked in Galilee; for He did not want to walk in Judea, because the Jews sought to kill Him.” Yet Jesus said to His disciples, “My friends, do not be afraid of those who kill the body” (Luke 12:4).

Solution: Jesus did not fear death; He merely avoided dying prematurely. Before the appropriate time Jesus would say, “My hour has not yet come” (John 2:4; 8:20). But when “His hour came” (cf. John 12:23), Jesus faced death bravely and courageously. Though humanly speaking Jesus shrunk from the horror of the Cross

Expanded from Heb. 5:7b:
Problem: On the one hand, it would seem that Christ shrunk from death, since He prayed “with vehement cries and tears to Him who was able to save Him from death” (Heb. 5:7). He said, “O My Father, if it is possible, let this cup pass from Me” (Matt. 26:39). On the other hand, we are led to believe that He faced death obediently and boldly, for He “steadfastly set His face to go to Jerusalem” (Luke 9:51), calmly facing His arrest, trial, and crucifixion, and repeatedly assuring His disciples He would rise again (Matt. 12:40–42; John 10:18).

Solution: Christ faced dath boldly but not eagerly. He met it willingly but not apathetically. Christ was “obedient to the point of death” (Phil. 2:8). He approached it boldly and bravely, declaring, “I have power to lay it down, and I have power to take it again” (John 10:18). He willingly submitted to the Father, saying, “not as I will, but as You will” (Matt. 26:39).

Christ’s willingness and boldness notwithstanding, He nevertheless felt the full emotional and existential impact of His impending death. He did pray with “vehement cries and tears,” but the writer adds, He “was heard because of His godly fear” (Heb. 5:7). Jesus wished as a man that His cup (death) could pass from Him (Matt. 26:39), but He willed, as the Father willed, that it would take place for the salvation of the world. While His soul was “troubled” about death, He never prayed, “Father, save me from this hour.” He only asked, “shall I say” this? His answer was no, “for this purpose I came to this hour. `Father glorify Your name’ ” (John 12:27–28). He never feared death as such, but banishment from the Father (Matt. 27:46). In fact, by His death Jesus overcame the power and fear of death, defeating the devil (Heb. 2:14).

; nevertheless, He prayed, “what shall I say? `Father, save Me from this hour’?” to which He answered with an emphatic no: “But for this purpose I came to this hour” (John 12:27). Jesus knew from the very beginning that He had come to die (cf. John 2:19–20; 10:10–11), and He never hesitated in His resolute purpose “to give His life a ransom for many” (Mark 10:45). However, to accomplish this as God had ordained and the prophets predicted, Jesus had to watch out for attempts on His life before the appointed time and way. For example, He was to be crucified (cf. Ps. 22:16; Zech. 12:10), not to be stoned, as the Jews sought to do on one occasion (see John 10:32–33).