You right , aggressive Buying of Bitcoin is allowed but should be done within our financial boundaries and shouldn't be done otherwise because by so doing,it might affect our consistency and can also slow down our Bitcoin accumulation pace as well. Another thing, Some investors go aggressive because they saw others going aggressive too and this kind of act/behavior is very wrong. Investors who sees Bitcoin accumulation as another form of competition might be triggered or tempted to invest more than what they can afford to invest by stepping out of their financial limit in other to outpace their Rival. Bitcoin Investment/accumulation Is a personal race and shouldn't be seen as a contest, let's be guided .
It’s a FOMO effect which is normal if you are actively checking your investment value and social media to get some news. It’s very hard to stop your emotion for being aggressive if you are already soaked in on the hype or trend of Bitcoin.
I rarely check my total investment on Bitcoin regardless of the price to avoid being distracted to my buying plan.
You can control yourself and purchase consistently by not checking the price frequently. Just purchased and send it to your non custodial wallet then do your normal life routine.