The 'Angry White Male' and a possible solution.

[Fumesucker]

3. Any other emotion in men is considered weakness by much of our culture

This is very much a cultural problem and is exacerbated by popular entertainment and media.

ETA: Also anger is a way of gaining energy, much of life these days is both physically and emotionally exhausting, anger is a way of sidestepping and dealing with the exhaustion, anger releases adrenalin which gives you a physical and even a mental boost.

Not to mention that in today's political climate if you're not angry then you're probably not paying attention to what's being done to you.