I suppose it depends on the app, I don’t know the one in the image but the ones I use does color the path with the heart rate.

When hiking, the redder spots are the harder parts and the whole line matches the graph with heartrate over time.

I could be benevolent and part of the population would be still against me (slumlords, libertarians, nazis).

After some attempts to kill me I doubt I couldn’t become aggressive against the population who wronged me.